Lake Sibhayi is the largest natural freshwater lake in South Africa, with a surface area of 77km². The lake is also wrongly known as Sibaya or Sibayi.
The lake is located in the Maputaland, or Umhlabuyalingana, area of KwaZulu-Natal, on the east coast of South Africa.
It is part of the Greater St. Lucia Wetland Park and is recognized under the Ramsar Convention as a "Wetland of International Importance" on 28 June 1991. In December 1999 The Greater St. Lucia Wetland Park was declared a UNESCO World Heritage Site.
279 bird species have been identified at Lake Sibhayi.
The Mseleni Water Project and Mbazwana Water Supply Scheme both get their water from Lake Sibhayi.