横向
1
Low-lying land surrounded by higher ground
4
Line dividing two countries
7
Distance north or south of equator
8
Imaginary line around the middle of Earth
9
Landform where river meets the sea
10
Land surrounded by water on three sides
11
Large natural elevation of earth
纵向
2
Largest hot desert in the world
3
Land surrounded by water
5
Cold treeless Arctic plain
6
Total number of people in an area