横向
1
Large area covered with trees
4
Seasonal heavy rainfall
6
Height above sea level
11
Total number of people in an area
纵向
2
Deep narrow valley with steep sides
3
Line dividing two countries
5
Flat elevated area of land
7
Goods sold to another country
8
Goods brought in from another country
9
Flat grassland in tropical regions
10
Distance east or west of prime meridian