Across
1
Line dividing two countries
3
Low area between mountains
4
Steep rock face at edge of land
6
Where river meets the sea
7
Cold treeless Arctic plain
11
Region surrounding the North Pole
12
Flat elevated area of land
Down
2
Land surrounded by water on three sides
5
Largest river in South America
8
Large body of water partly enclosed by land
9
Land surrounded by water
10
Dry land with little rainfall