横向
1
Cold treeless Arctic plain
4
Region near the equator
5
Where river meets the sea
6
Largest hot desert in the world
7
Total number of people in an area
8
Goods brought in from another country
9
Body of water surrounded by land
10
Flat elevated area of land
12
Deep narrow valley with steep sides
纵向
1
Region between the two tropic lines
2
Largest river in South America
3
Land surrounded by water on three sides
11
Chain or group of islands