横向
1
Deep narrow valley with steep sides
3
Flat elevated area of land
5
Region surrounding the North Pole
9
Flat grassland in tropical regions
10
Land surrounded by water
11
Largest ocean on Earth
纵向
2
Region between the two tropic lines
4
Largest river in South America
6
Area where water covers the soil
7
Distance east or west of prime meridian
8
Tool for finding directions