# Package: DesertTopography

Parent: Physiography

## Relevant types:

Name | Type | Definition | Description
--- | --- | --- | ---
Desert_S | Feature Type | An arid and treeless uncultivated sparsely populated tract of land. | -
Oasis_P | Feature Type | A fertile tract of land that occurs in a desert wherever a permanent supply of fresh water is available. | Oasis vary in size from a pond with a group of date palms around small springs to the oasis cities of the deserts with extended agricultural cultivation.
Oasis_S | Feature Type | A fertile tract of land that occurs in a desert wherever a permanent supply of fresh water is available. | Oasis vary in size from a pond with a group of date palms around small springs to the oasis cities of the deserts with extended agricultural cultivation.
Sabkha_P | Feature Type | A natural depression in arid or semi-arid regions whose bed is covered with salt encrusted clayey soil. | Found especially in North Africa and Arabia.
Sabkha_S | Feature Type | A natural depression in arid or semi-arid regions whose bed is covered with salt encrusted clayey soil. | Found especially in North Africa and Arabia.
SaltFlat_S | Feature Type | A flat area of natural surface salt deposits. | May also be used to describe smaller areas; these are commonly termed salt pans.
SandDunes_S | Feature Type | One or more mounds or ridges of sand usually formed by the wind. | -