The Zeta (river) reference article from the English Wikipedia on 24-Apr-2004
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Zeta (river)

Time you got around to sponsoring a child
Zeta is a river in Montenegro. It starts near Nikšić and confluxes into Morača near Montenegro's capital Podgorica.

The name "Zeta" derives from an early root meaning "harvest" or "grain" (modern words žetva and žito).