Across
1
Deep narrow valley with steep sides
4
Where river meets the sea
5
Total number of people in an area
6
Land surrounded by water
7
Height above sea level
8
Region near the equator
9
Imaginary line around the middle of Earth
10
Largest river in South America
Down
2
Region surrounding the North Pole
3
Chain or group of islands
5
Land surrounded by water on three sides
11
Flat grassland in tropical regions