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This page is about the location. For the quest with the same name, see Oasis (quest).
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Fo3 Oasis Harold's Vale.png
Icon settlement medium.png
Oasis map.jpg
Map MarkerOasis
LeadersTree Father Birch
Lead Mother Laurel
Cell NameOasis01 (gate)
OasisCave01 (sunken chambers)
OasisCave02 (damp cave)
OasisCave03 (caverns)
ref id000012c1 (gate)
00017e18 (sunken chambers)
00017e19 (damp cave)
0002a58a (caverns)

The innocent creatures are drawn here by His gifts. They come from across the Wasteland to live in this sanctuary. This part of the world is healing, my friend, and it's all thanks to Him.

— Tree Father Birch

Oasis is an unique vale in the northern Capital Wasteland, to the north-west of clifftop shacks.


What is known as the Oasis was once just one of many mines scattered across the landscape of the United States. The extensive network of caves beneath it was used as impromptu shelter by the inhabitants of a nearby mining town from the bombs. As the time passed, the sheltered rocky vale was stripped of mining equipment and other installations, with only a handful of artifacts surviving to the 23rd century.[1]

Sheltered by the rock formations in the northern Capital Wasteland, it gained a new lease on life in the 2240s or 50s when Harold found himself overwhelmed by Bob in his travels and laid down roots in this area[2] in what the Treeminders call the Harvest Month (when Bob's seed pods ripen and disperse their seeds, resulting in the creation of new trees, grass, and plants).[3]

With Harold's mutation progressing further he became the unwilling heart of an oasis in the desolate wastelands.[4][5] Around 2257, a small cult formed under Birch, dedicated to the worship of Harold. Birch saw in Harold not an unfortunate mutant condemned to live out his life as a tree, never again to resume his wasteland travels, but a god. The cult, the Treeminders, were to be his last line of defense.[6]

The Treeminders shun technology in favor of nature, blaming technological progress for all human misery.[7] The control over the cult, exercised by Tree Father and Leaf Mother (Birch and Laurel), with equal say in its affairs.[8] As the Oasis grew and nature once again reappeared in the wasteland, the cult confronted the hostility of the wasteland. Although they disdained technology, the Treeminders continued to use firearms, to remain on equal footing with their enemies.[9] Only select outsiders were permitted to live long enough to enter the Oasis, though it was rare. Most are turned away, some are killed when they try to gain entry by force, and others are shot on sight, like raiders.[10]

The Lone Wanderer in 2277 is the first one in years to visit the vale.[11] The Oasis is one of the most fertile places in the wasteland, filled with lush vegetation, trees, and even birds and squirrels living within the sheltered forest.[12] No other place in the Capital Wasteland is so teeming with life,[13][14] although there are locations far from the Capital Wasteland, including Zion Canyon and Jacobstown, that have comparable amounts of plant and animal life.


The Oasis is located inside a large rock formation in the north of the Wasteland. The gate to enter it is accessed via a narrow passage in its western face.


Fo3 Oasis Map.png

The Oasis itself is a small vale located inside the rock formation. It's a small area, centered around a makeshift pavilion with the basin of purification. Scattered inside alcoves created by the rocks and trees are resting places for the Treeminders.

Harold's Grove

The grove where Harold rests is a small area centered around him.[15]

Oasis caves

Fo3 Oasis Caves Map.png

Accessible only with the key from Cypress, the caves are straightforward, though infested with Mirelurks and their variants.</ref>[16]

Sunken chambers

Fo3 Oasis Sunken Chambers Map.png

The lowest level of the caves below the Oasis is partially flooded. It also contains a survivor camp with the remains of a Great War survivor and contain a plethora of "nifty gizmos".[17][18] Of course, Harold's heart is also in these chambers.

Notable loot

Damp cave

Fo3 Oasis Damp Cave Map.png

The damp cave is a single, large chamber with several mirelurks, some minor loot, and a direct exit to Harold's grove.

Notable loot





Oasis appears only in Fallout 3.


  1. The Lone Wanderer: "Any information you could give me on the caves below Oasis would be helpful."
    Linden: "Oasis is located near what used to be an old mining town before the bombs fell. When the attacks started about 200 years ago, many people took shelter in the natural caves that dotted the area. The old gate that stands at the mouth of Oasis Cave is the last piece of architecture from those days."
    (Linden's dialogue)
  2. The Lone Wanderer: "You don't actually seem that sad. Why do you want to die?"
    Harold: "I've been literally rooted to this spot thanks to Bob for maybe twenty or thirty years... I can't even remember anymore. Can you imagine being stuck in one place for that long not being able to eat or to read or to sleep or anything? In the meantime, I have these Treeminders bothering me every day about things I don't even care about. I can't stand it anymore."
    (Harold's dialogue)
  3. The Lone Wanderer: "How is it you're causing all of these things to grow around you?"
    The Lone Wanderer: "What's causing this place to grow?"
    Poplar: "In what we call the Harvest Month, the Great One creates seeds among his branches within seed pods. At the end of this time, the pods open and the seeds are carried quite easily upon the wind. It's quite beautiful. Wherever the seeds take purchase, they grow into trees, plants, grass or all manner of wonderful things."
    (Poplar's dialogue)
  4. The Lone Wanderer: "How is it you're causing all of these things to grow around you?"
    Harold: "It's kind of embarrassing really. Once a year, Bob decides he's going to go ahead and start growing these weird pods filled with tiny seeds. Well, all it takes is a good wind and the seeds just fly everywhere. I call them Herbert's Seeds. He hates that!"
    (Harold's dialogue)
  5. The Lone Wanderer: "Why do you call yourselves Treeminders?"
    Birch: "We care for this place and keep it safe from those who would seek to exploit it. He gives to us, so we give back to Him. It's an arrangement that's worked well for almost two decades. We shun technology and embrace nature. That's the life of a Treeminder"
    (Birch's dialogue)
  6. The Lone Wanderer: "How did the Treeminders begin?"
    Birch: "When I first beheld the glory of the Great One, I knew there'd be others who would seek to do Him harm. I also knew He would be calling others that he felt were pure of heart to protect Him. Right then and there I created the Treeminders... the Great One's last line of defense."
    (Birch's dialogue)
  7. The Lone Wanderer: "I think you're all a bunch of lunatics."
    Birch: "Ha ha ha. I don't expect you to understand everything you see here. After all, you carry the taint of technology upon you. Treeminders shun technology and embrace nature. All technology has brought the world is violence and death."
    (Birch's dialogue)
  8. The Lone Wanderer: "Were you aware that Laurel gave me this Liniment?"
    Birch: "Of course I am. I know everything that goes on in Oasis. Laurel is free to pursue whatever path she chooses. A long time ago, it was agreed that the Tree Father and the Leaf Mother hold equal say. I don't seek to change those customs. I just hope that when the time comes, you'll make the right choice."
    (Birch's dialogue)
  9. The Lone Wanderer: "If you hate technology, why carry weapons?"
    Birch: "Sadly, the Wasteland is a hostile place and sometimes we're forced to defend ourselves against it. If that means fighting with manufactured weapons, then so be it. Had He not asked to see you, you never would have gotten this close to the gates."
    (Birch's dialogue)
  10. The Lone Wanderer: "How do the Treeminders normally handle other Outsiders?"
    Birch: "If the Outsider doesn't have His blessing, we simply deny him entry to our home. If they persist on trying to gain entry, or display any hostile act that could potentially harm the Great One, we take action. If the Outsider were a Raider or some other nefarious type, we ensure they don't report our location back to their comrades."
    (Birch's dialogue)
  11. The Lone Wanderer: "Which brings us to why I'm here, I suppose."
    Birch: "Yes. Indeed it does. Sorry I don't speak to Outsiders very often and I tend to get lost in conversation. As you approached Oasis, He said you were coming and I was sent out to meet you personally with a request. He wishes to meet with you. You'd be the first Outsider to do so in a very long time."
    The Lone Wanderer: "So what was all this about meeting someone?"
    Birch: "Yes, my apologies. I don't speak to Outsiders very often and I tend to get lost in conversation. As you approached Oasis, He said you were coming and I was sent out to meet you personally with a request. He wishes to meet with you. You'd be the first Outsider to do so in a very long time."
    (Birch's dialogue)
  12. Fallout 3 Official Game Guide Game of the Year Edition p.319: "Oasis is a fertile, verdant dot in the center of all the desolation. This odd hidden vale is home to a strange, tribal-like people who call themselves the Treeminders. You are welcomed into Oasis with open arms, and their leader, Tree Father Birch, invites you to meet their god. Oasis is tucked away inside a giant rocky outcrop in the mountains just northeast of the monorail and freeway skeletons, and the entrance is close to a rope bridge."
  13. The Lone Wanderer: "Amazing, this place seems so abundant with animal life."
    Birch: "The innocent creatures are drawn here by His gifts. They come from across the Wasteland to live in this sanctuary. This part of the world is healing, my friend, and it's all thanks to Him."
    (Birch's dialogue)
  14. There are sounds of birds, crickets, and squirrels as background sounds in Oasis.
  15. The Lone Wanderer: "Hey, maybe if you tell me what Harold is scared of I won't be scared either."
    The Lone Wanderer: "Tell me, too! Then I won't be scared either."
    Yew: "Awww, I never knew an Outsider could be scared of anything! Harold told me that he's scared of fire. If fire ever got on him, it would burn him and Bob until they were all gone. That's why we keep the fires far away from him."
    (Yew's dialogue)
  16. The Lone Wanderer: "Any information you could give me on the caves below Oasis would be helpful."
    Yew: "My parents told me never to go past the old gate... there are monsters in there!"
    (Yew's dialogue)
  17. The Lone Wanderer: "I'm not a charity. You want to die, cough up some caps."
    Harold: "Well, I used to carry those pesky caps a long time ago, but I think my pockets are in those shrubs over yonder. I'm pretty sure the caves below me are full of all kinds of nifty gizmos you could take on your way to my heart. Help yourself!"
    (Harold's dialogue)
  18. The Lone Wanderer: "Is there anything down there to look out for?"
    Harold: "Sometimes I feel stuff tickling me, but I think that's just Bob getting back at me for all the times I called him Herbert."
    (Harold's dialogue)
  19. Three Dog's dialogue: "Here's a question for all you faithful listeners. Have you guys and gals ever seen... a tree? No, no, no. Not those shriveled black things. I’m talking real trees. Brown bark, green leaves, photosynthesis, all that good stuff. Now what if I, the all-powerful Three Dog, were to tell you that somewhere right here in the Capital Wasteland, there’s a place with LOTS of trees. A veritable Oasis of green in that depressing sea of brown. Look, it was years ago, and I MAY have been experimenting with Jet at the time, but I’m telling you, it’s out there..."
  20. The Preacher: "And the sun will rise in the north! No! the northwest! For forty-four days and sixty-seven nights! And we'll never notice! You don't know, you can't know. Little fools. You wish you knew! You wish! But only I know! Only me... only me... only me... The sky will fall! The Earth will rise! The stars will shine open their toothy grins and caress the sun with their love! Oh... God... it hurts. My head... why doesn't it ever stop hurting... why? Please... please... I can hear it! Moving! Pulsing! Just leave me alone! Not one step further! Not one! Come no closer! I'll do it! I'll blow us ALL to hell! All of us! Me, you... and the worm... Beware, worm! I shall destroy you! With the fire of this small sun before me! BEWARE WORM! Not one step further! Hungry... hungry... so hungry. What? No. I'm not hungry. The worm is hungry. Hungry for me, for you, and for fire. THE SUN! IT BURNS! Why does it burn? Why have we put the sun into a jar? And what did we do with that jar? We broke it all over our little world... In fourteen hundred and ninety-two, your mother and my mother were hanging up clothes around the mulberry bush... Fire, fire, burning bright... burning... fire... pain, misery, peace, love, murder, death, death, death... love... Trees! So many trees! To the north! But be careful... the trees... are deadly, and the trees too will be consumed in the belly of the great fat worm! A great crack shall open in the Earth and swallow the non-believers! And they shall weep! Weep! Weep! Tears and salt and earth and dirt! Try new BLAMMO! Soap! Blasts stains out! Blasts the whole world out! We've all been BLAMMO'd!"
    (The Preacher's dialogue)
  21. The Lone Wanderer: "Any information you could give me on the caves below Oasis would be helpful."
    Poplar: "Be wary of the water in the caves, I fear they still carry the sting of radiation from the bombs."
    (Poplar's dialogue)