Across
1
Largest river in South America
5
Chain or group of islands
6
Vast body of salt water
10
Imaginary line around the middle of Earth
12
Height above sea level
Down
2
Line dividing two countries
3
Low area between mountains
4
Landform where river meets the sea
7
Deep narrow valley with steep sides
8
Region near the equator
9
Steep rock face at edge of land
11
Long-term weather patterns of an area
13
One of seven major landmasses