(an acronym, in Afrikaans, for Orange-Fish Tunnel). Oviston is on the shores of the Gariep Dam. A hydro-electric generating plant is placed at the Fish River egress, but is uneconomic and is not in use.

Mixing of waters from two watersheds has been environmentally disastrous--much of the Fish River ecosystem is now taken over by Orange River flora and fauna.

Flora

At the river mouth, there is Valley thicket, dune thicket, riparian vegetation and fynbos.

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