横向
1
Vast body of salt water
4
Large natural stream of water
5
Body of water surrounded by land
7
Largest river in South America
8
Height above sea level
纵向
2
Half of the Earth
3
Line dividing two countries
6
Low-lying land surrounded by higher ground
9
Cold treeless Arctic plain
10
Raised area of land, smaller than a mountain
11
Large area covered with trees