横向
1
Area where water covers the soil
4
Large body of water partly enclosed by land
5
Flat grassland in tropical regions
6
Region between the two tropic lines
7
Large natural stream of water
10
Largest river in South America
纵向
2
Landform where river meets the sea
3
Chain or group of islands
8
City that is seat of government
9
Flat elevated area of land
11
Wearing away of land by water or wind