Fallout random encounters

Generic encounters
The following system is used to determine generic random encounters on the world map. First, the game identifies which tile the player is located in, according to the following map:

Once the location is determined, the game takes into account the terrain type the player is located in according to the top table. There are no separate City or Coast encounter tables; they use the table corresponding to the number in the above table.

Next, the game calculates the actual encounter using the values from the lower table. These are percentile chances for an encounter of a given type. Generally speaking, encounters with numbers closer to 1 are considered worse (may include difficult combat encounters or bad happenings, such as dehydration), while encounters with numbers closer to 6 are better (free items or special NPC encounters).

Some perks may modify the odds, reducing the occurrence of bad encounters and increasing the incidence of good ones.

Mountain, Vault
Despite the name, this encounter table is used in many places, including the mountains around Mariposa Military Base, around Vault 13, three mountain squares adjacent to the Raiders camp tile, one mountain square adjacent to the Junktown tile (top left), mountains near Adytum, and the mountains adjacent to The Glow.

Other

 * Random encounter merchants
 * Lox
 * Terrance
 * Julian
 * Dale