| On the Western sides of continents
||Cold ocean currents exist off the Western sides of continents. Winds blowing over these currents lose their moisture over the sea and are dry by the time they get to sea.
|In the interior of continents
||Winds blowing over continents are dry by the time they get to the interior of continents.
|The leeward side of tall mountains
||Moisture carrying winds are blocked by the side (windward side) of tall mountains. The other side (leeward side) is consequently dry, and deserts may be formed there.
|Depressions/basins in the interior of continents
||The surrounding highlands around depressions/basins cause a rainshadow effect leaving the depression dry.