The Nyl River (Afrikaans: Nylrivier) is a watercourse in Limpopo Province, South Africa.

It is known as Nylsvlei, from the word vlei usually applied to intermittent lakes, for the main course in its midst flows northeastwards very slowly.

[7] The flood-plain of the Nyl, also known as the Nyl pan (Afrikaans: Nylsvlei), is a seasonal wetland, for the basin of the Mogalakwena is affected by a five-year rain cycle in which the river is virtually dry for five years, followed by another five years in which there is sufficient water flow.

[8] It is one of the largest single ecosystems in South Africa providing a haven for aquatic birds.

[9] This flood-plain is now the site of the Nylsvley Nature Reserve,[10] a Ramsar wetland of international importance.