Mfolozi River
| Umfolozi River (uMfolozi) | |
| River | |
 The Umfolozi's new and old courses near the mouth. The Msunduzi River enters from the left (south), enclosing a wetland. Note the silt plume in the sea.
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| Country | South Africa |
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| Province | KwaZulu-Natal |
| Mouth | |
| - coordinates | 28°23′32″S 32°25′27″E / 28.39222°S 32.42417°ECoordinates: 28°23′32″S 32°25′27″E / 28.39222°S 32.42417°E |
  Location of the Umfolozi River mouth
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The Umfolozi River (also uMfolozi, Imfolozi or Mfolozi) is a river in KwaZulu-Natal, a province of South Africa. It is formed by the confluence of the Black (Imfolozi emnyama) and White Umfolozi (Imfolozi emhlope) Rivers near the southeastern boundary of the Hluhluwe-Umfolozi Game Reserve. The isiZulu name imFolozi is generally considered to describe the zigzag course followed by both tributaries, though other explanations have been given.
The river flows in an easterly direction to the Indian Ocean at Maphelana, a coastal resort just south of the St Lucia River mouth. It originally meandered over the Monzi Flats, where it split into numerous slow-flowing channels before entering the St. Lucia Estuary at Honeymoon Bend. The slow-moving water and reed beds in channels operated as a natural filtering system that removed silt from the Umfolozi floodwaters and created a rich habitat for numerous species.
During the 1950s, the Umfolozi Landowners Association contained and artificially channeled the river through the Monzi Flats to develop sugarcane farms. The new Umfolozi canal resulted in the unfiltered water depositing its silt load after entering the slower moving St. Lucia Estuary. This caused the estuary mouth to rapidly silt up. There had only been one record of this occurring until that time, during the sustained drought during the 1930s. At 28°20′58″S 31°58′46″E / 28.34944°S 31.97944°E the Black Umfolozi River and the White Umfolozi River, join to form the Umfolozi.
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