横向
1
Large natural stream of water
3
Low area between mountains
4
Total number of people in an area
9
Largest hot desert in the world
纵向
2
Flat grassland in tropical regions
5
Chain or group of islands
6
Where river meets the sea
7
Land surrounded by water
8
Ocean between Americas and Europe/Africa
10
Large natural elevation of earth
11
Largest ocean on Earth