The lowest part of most bolsons is occupied by a landform called playa. Which category of landform formation does it represent ?

A playa is a flat-bottomed depression found in desert regions and represents a classic example of arid landforms. It is the central feature of a bolson, which is an internally drained desert basin surrounded by mountains.

• Formation: In arid environments, ephemeral streams (temporary water flow) carry fine sediment and dissolved salts from surrounding highlands into the basin's lowest point.
• Mechanism: When the water evaporates due to the intense heat and dry climate, it leaves behind a level plain composed of silt, clay, and evaporated salts.
• Characteristics: Playas are often called alkali flats or salt pans. While water (fluvial action) is the agent of transport, the landform is classified as arid because it is defined by the high evaporation and lack of external drainage characteristic of desert geomorphology.