There are four Biomes adjacent to the starting zone when beginning a year. Each cardinal direction has an associated biome. These are:
Tier 1 areas do not require bridge repairs to access them. There are two areas that the player can immediately access: the Desert to the west and Plains to the east.
Tier 2 areas require 1 bridge repair material to be accessed. These are the Tundra to the north and the Jungle to the south.
Tier 3 areas requiere 2 bridge repair materials to be accessed. These are the second Desert area and the second Plains area.
Tier 4 areas requiere 3 bridge repair materials to be accessed. These are the second Tundra area and the second Jungle area.