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Mount Desert Island
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Mount Desert Island as seen from the mainland
Fo4FH Worldmap.png
Part ofMaine
FactionsChildren of Atom
Far Harbor
Vault 118

Mount Desert Island, otherwise known as The Island is the setting of Fallout 4 add-on Far Harbor.


Before the Great War, this island off the coast of Maine in the New England Commonwealth was home to Acadia National Park.[1] The island also hosted an experimental wind farm on the mountainside as a "clean" alternative to nuclear power, but was set to be shut down and dismantled at the end of October 2077 due to the threat that wind power presented to its nuclear-based parent company.[2][3]

After the War, Mount Desert Island was radically changed. The island is now perpetually blanketed in a thick, radioactive fog; nearly every species on the island has been severely mutated, and only a few areas are still left habitable.[4] Although, the denizens of Far Harbor have managed to keep the fog at bay with fog condensers, a technology developed and distributed by Acadia. Unfortunately, there are elements on the island that want to see the condensers turned off and the entire island finally being covered in the radioactive fog.

There are three major factions that inhabit the island: the residents of Far Harbor, the Children of Atom operating out of The Nucleus, and Acadia, a refuge for runaway synths. It certainly does not help that the residents of Far Harbor are by and large distrustful of any outsiders.[5] The main conflict sprouts from Far Harbor and the Children of Atom being at odds with each other; the Children of Atom welcome and encourage the radioactive fog to consume the island, believing it to be the will of their god, Atom,[6] and this is obviously not in the best interest of the coastal town. Far Harbor has literally been pushed to the edge, with the docks being the only habitable area safe from the fog. In response to this, residents of Far Harbor have killed several Children of Atom missionaries over the years due to this endangerment, but this has only encouraged the Children to spread their gospel with increased fervor.[7]

Acadia is the third wheel in this conflict, having only been established shortly after the hostilities between Far Harbor and the Children of Atom began.[8] Naturally, a large portion of Far Harbor residents are suspicious of the synth refuge to the south, even after Acadia provided the town with fog condensers, meaning Acadia has been roped into the conflict, despite efforts to reconcile Far Harbor and the radioactive zealots.[5][9]


Main article: Far Harbor map

The Island is approximately one-fifth the size of the Commonwealth, and consists of ruined civilization, mountains, hilly pine forests, wetlands and swamps. Most notably, the town of Far Harbor rests on the northeast edge of the island, Acadia rests atop the mountains in the east-central part of the island, and The Nucleus appropriately lies on the tip of a peninsula near the center of the island.

The main island is connected by a series of roads, but swimming is required to get to the smaller islands off the coast. Major points of interest include the MS Azalea, moored on a peninsula in the east, the Cliff's Edge Hotel and Vault 118 beneath it, Echo Lake Lumber Mill on the western side of the island, Brooke's Head Lighthouse on the southern coast, the Vim! Pop factory on an island south of the main island, and the Cranberry Island Bog off the southern coast.

Smaller islands include;

  • Bartlett's Island
  • Great Cranberry Island
  • Little Cranberry Island


Concept art


Mount Desert Island appears only the Fallout 4 add-on Far Harbor.


  1. Far Harbor loading screen hints: "Once home to a popular national park, the island surrounding Far Harbor is covered with the now dead woods and irradiated creeks that the prewar government originally sought to preserve."
  2. Far Harbor loading screen hints: "Before the Great War, the island surrounding Far Harbor was the site of an experimental wind farm, a "clean" alternative to nuclear power."
  3. Far Harbor wind farm terminals
  4. Far Harbor loading screen hints: "The island surrounding Far Harbor is covered in a radioactive fog, making all but a few places uninhabitable."
  5. 5.0 5.1 Far Harbor loading screen hints: "The people of Far Harbor distrust outsiders, but particularly hate the Children of Atom, a cult who worships the radioactive fog that's slowly killing the island."
  6. Far Harbor loading screen hints: "The Children of Atom believe the radioactive fog is a gift from Atom, and it will cleanse and purify the island."
  7. Far Harbor loading screen hints: "Many Children of Atom missionaries have been exiled or killed by the people of Far Harbor over the years. The bloodshed has only succeeded in making the Children more militant."
  8. The Sole Survivor: "If this thing involves the whole island, then you need help. I can be your problem-solver if you let me in."
    DiMA: "I suppose there's something to be said about refusing help even when it's offered and you're in need. There's a conflict that's been brewing on this island, shortly after we built Acadia. Between Far Harbor and the Children of Atom."
    Chase: "Simply put: They want to kill each other, and each side wants us to help them."
    Faraday: "We've tried to stay neutral, but Far Harbor was going to be wiped out by the Fog, so that's when we built the Condensers for them."
    DiMA: "And I was friends with the previous leader of the Children of Atom, Confessor Martin. I even gave them their headquarters, the submarine base they named the Nucleus."
    Chase: "Which was a mistake, because Martin is gone and the new Confessor, Tektus, is completely insane."
    DiMA: "He's been threatening us, to force us to choose a side. I left behind something very important in that submarine base I gave them."
    Faraday: "DiMA's earliest memories are stored in the military computer banks in that base. The prewar security systems and Confessor Martin's good will were supposed to keep them safe."
    Chase: "But now Tektus is in charge, and he's after DiMA's memories. We don't even know what's in them."
    DiMA: "But we do know that I spent nearly a century on this island, alone. Whatever's in there is too dangerous to allow Tektus to get his hands on them."
    (DiMA's, Chase's, and Faraday's dialogue)
  9. The Sole Survivor: "You're keeping Far Harbor safe, is that it?"
    DiMA: "Not exactly. They're fiercely independent, but the Fog was starting to choke more and more of the island, so I proposed a trade. We would give them the technology to keep the Fog at bay, in return for them being a lifeline to the outside world. A safe dock and a place to buy supplies. Unfortunately, the Children of Atom view the radioactive fog as a holy portent, and their bloodied history with Far Harbor puts us at odds."
    (DiMA's dialogue)