The ecology of Gaeleth is that of an alien world, with species unique to Gaeleth and the SisterWorlds in each of its ecological biomes. Below is a list of biomes, complete with typical encounters within those biomes. Terran life forms are introduced species to the world, and no one is certain how many of the other life forms are native, or came from other worlds than Gaeleth. Some biomes overlap in the overall ecological scheme: mountain forests, for instance, can be found in both 'mountains' and 'forests' entries. Terran examples of biome locations can be found at http://www.statemaster.com/encyclopedia/Biome.

Deserts
Sand Desert
Xeric Shrubland
Semidesert

Forests
Taiga
Temperate Broadleaf
Tropical Rainforest
Tree Savanna
Subtropical Rainforest
Monsoon Forest
Subtropical Dry Forest
Mountain Forests
Monsoon Forest

Arctic
Tundra
Alpine Tundra
Ice Desert
Taiga

Mountains
Mountain Forests
Alpine Tundra
Ice Desert

Grasslands
Temperate Steppe
Grass Savanna
Dry Steppe

Oceanic
Ocean Desert
Shoals
Ocean Floor
Deeps

Freshwater
Marsh
River
Floodplains
Great Lake
Swamp

Other
Mediterranean
Urban
Subterranean
Undead