Across
1
Low-lying land surrounded by higher ground
3
Line dividing two countries
5
Large natural stream of water
6
Region between the two tropic lines
Down
2
Tool for finding directions
4
Raised area of land, smaller than a mountain
5
Ridge of rock or coral near the surface
7
Imaginary line around the middle of Earth
8
Low area between mountains
9
Chain or group of islands