Across
1
Line dividing two countries
4
Low area between mountains
5
Land surrounded by water on three sides
6
Large body of water partly enclosed by land
7
Largest river in South America
9
Ocean between Americas and Europe/Africa
Down
2
Chain or group of islands
3
Largest hot desert in the world
8
Cold treeless Arctic plain
10
Region between the two tropic lines
11
Deep narrow valley with steep sides