Across
1
Where river meets the sea
3
Steep rock face at edge of land
4
Deep narrow valley with steep sides
6
Chain or group of islands
7
Land surrounded by water on three sides
9
Line dividing two countries
12
Mountain that can erupt with lava
Down
2
Low-lying land surrounded by higher ground
3
Long-term weather patterns of an area
5
Largest river in South America
8
Low area between mountains
10
Vast body of salt water
11
Narrow sea inlet between cliffs