The Map Tiles form the game board. Note that the tiles are double sided with different terrains on both sides. The A sides of the map tiles are a bit more open, the B sides have more Forests and Mountains. The differences are not that big, so you can just randomly choose which side is up for each Map Tile. For the first time you play you can just use the A sides up.
Each Map Tile is a 7x7 grid that consist of seven different terrain types with their own effects: Meadow, Mountain, Volcano, Temple, Forest, Water and Ruins.