横向
1
Deep narrow valley with steep sides
4
Goods brought in from another country
5
Vast body of salt water
6
Body of water surrounded by land
7
Seasonal heavy rainfall
8
Ridge of rock or coral near the surface
9
Flat grassland in tropical regions
纵向
1
Tool for finding directions
2
Wearing away of land by water or wind
3
Physical features of land
10
Low-lying land surrounded by higher ground
11
Total number of people in an area
12
Line dividing two countries