Across
1
Where river meets the sea
6
Largest hot desert in the world
7
Line dividing two countries
8
Steep rock face at edge of land
10
Low-lying land surrounded by higher ground
11
Distance east or west of prime meridian
12
Vast body of salt water
Down
2
Low area between mountains
3
Large natural elevation of earth
4
Ocean between Americas and Europe/Africa
5
Imaginary line around the middle of Earth
9
Chain or group of islands