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The Mngazi estuary
(31°41' S;
29°27' E)
lies just south of the coastal town of Port St Johns on the Transkei coast of the Eastern Cape. This system drains a catchment area of approximately 561 sq. km. Agriculture accounted for about 29% of the catchment land-cover in the Mngazi system. Most of this comprised subsistence farming, commercial forestry, and temporary commercial irrigated agriculture. Only 1% of the catchment was degraded, comprising degraded bushland and grassland. Approximately 62% of the land-cover was natural; most of this was grassland, bushland and forest. Residential (rural) development accounted for about 7% of the catchment land-cover in the Mngazi system.
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