横向
1
Deep narrow valley with steep sides
3
Wearing away of land by water or wind
4
Ridge of rock or coral near the surface
8
Where river meets the sea
纵向
2
Body of water surrounded by land
3
Goods sold to another country
4
Large natural stream of water
5
Line dividing two countries
6
Flat grassland in tropical regions
7
Distance east or west of prime meridian
9
Large natural elevation of earth