横向
1
Low-lying land surrounded by higher ground
3
Large area covered with trees
5
Mountain that can erupt with lava
7
Region surrounding the North Pole
10
Large natural stream of water
纵向
2
Largest river in South America
4
Area where water covers the soil
6
Goods sold to another country
8
Deep narrow valley with steep sides
9
Distance north or south of equator
11
Where river meets the sea
12
Steep rock face at edge of land