Nylsvley Nature Reserve is a 40 km2 (15 sq mi) protected area, located on and beside the seasonally-inundated floodplain of the Nyl River, the uppermost section of the Mogalakwena which has a very shallow gradient.

The area has been declared a Ramsar wetland site because of its international conservation importance.

The floodplain is made up of extensive reedbeds and grassveld surrounded by open woodland.

The name 'Nylsvley' originated in vlei, a pan or seasonally flooded area, and in the word for "Nile".

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