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The Mtentu estuary
(31°15' S;
30°3' E)
is situated north of the coastal town of Port St Johns on the Transkei coast of the Eastern Cape. This system drains a catchment area of approximately 965 sq. km. About 35% of the catchment was under agriculture, almost entirely comprising subsistence farming. Approximately 14% of the land-cover comprised degraded grassland while about 50% was natural grassland, bushland, and forest. Very little urban development (less than 1%) occurred in the catchment and almost all of this was (rural) residential.
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