横向
1
Deep narrow valley with steep sides
3
Cold treeless Arctic plain
5
Total number of people in an area
6
Land surrounded by water on three sides
7
Line dividing two countries
8
Piece of land jutting into the sea
9
Large area covered with trees
纵向
2
Height above sea level
3
Region between the two tropic lines
4
Physical features of land
10
Low area between mountains
11
Region surrounding the North Pole
12
Land surrounded by water
13
Steep rock face at edge of land