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The Duiwenhoks estuary
(34°22' S;
21°0' E)
is situated west of the coastal town of Mossel Bay in the Western Cape. The river is approximately 83 km long with a catchment area of 1 340 sq. km. About 46% of the land-cover in the Duiwenhoks catchment was agriculture, mainly temporary commercial dryland agriculture, improved grassland, and some temporary commercial irrigated agriculture. Approximately 1% of the catchment comprised degraded shrubland while about 52% was natural shrubland, bushland and grassland. Urban development, mainly residential development associated with the inland town of Heidelberg, accounted for about 1% of the land-cover in the Duiwenhoks catchment.
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