横向
1
Deep narrow valley with steep sides
4
Large natural stream of water
6
Dry land with little rainfall
9
Goods brought in from another country
10
Large slow-moving mass of ice
11
Flat grassland in tropical regions
纵向
2
Where river meets the sea
3
Tool for finding directions
5
Raised area of land, smaller than a mountain
7
Large area covered with trees
8
Imaginary line around the middle of Earth