横向
1
Low area between mountains
4
Largest ocean on Earth
5
Large natural elevation of earth
6
Ocean between Americas and Europe/Africa
11
Imaginary line around the middle of Earth
12
Line dividing two countries
纵向
2
Total number of people in an area
3
One of seven major landmasses
7
Body of water surrounded by land
8
Where river meets the sea
9
Distance east or west of prime meridian
10
Region surrounding the North Pole
13
Chain or group of islands