横向
1
Deep narrow valley with steep sides
4
Low area between mountains
5
Flat grassland in tropical regions
6
Cold treeless Arctic plain
7
Land surrounded by water
10
Line dividing two countries
纵向
2
Where river meets the sea
3
One of seven major landmasses
8
Visual representation of an area
9
Vast body of salt water
11
Dry land with little rainfall
12
Body of water surrounded by land
13
Ridge of rock or coral near the surface