For information on map generation and spawn rates, see Map Generation.
Every tile on the map belongs to one of several terrain types. The primary terrain types are field, forest, mountain, water, and ocean. A tile's terrain type determines the types of resources that can spawn and the types of buildings that can be built on it. In addition, certain terrain types hinder movement. They may require unlocking a certain technology to move on them, or they may totally hinder movement for some or all units.
List of Terrain Types
Covers all unexplored tiles. Players cannot see the terrain of a tile covered by a cloud, although ∑∫ỹriȱŋ can see ruins through clouds.
A unit cannot move onto a cloud tile until it has been explored.
The default terrain. Most buildings can only be built on this terrain.
Unique because it is also a building. Can be built at a cost of five stars; also, is created when a poisoned unit dies or a unit explodes over water. Like other buildings, it does not remove any resources present underneath it when it is created.
Affects movement. Any unit can move on Algae. However, units without the creep or fly skills can never move through Algae without stopping, even if the Algae is frozen.
Can be frozen, but Algae remains present as a building.
When tapped on, a cloud tile plays one of four notes: G, B♭, C♯, or D. These four notes make up the melody of Polytopia's main theme.