A mere 12 miles long.
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The only ones i know of (because ilive by them) are the river Lea and the New River Rivers in Hertfordshire are, River Ash, Bayford Brook River Beane River Bulbourne River Chess River Colne Cuffley Brook River Gade River Hiz River Ivel River Lee/Lea Lynch Brook River Mimram New River Pix Brook River Quin Rags Brook River Rib River Stort Small River Lea Spital Brook Theobalds Brook Turkey Brook River Ver Wormleybury Brook
A river can be as long as a country! For example the Mississippi River is almost as long as the U.S vertically.
The river Alt is 28kilometers long.
The Charles River is about 81mi long.
The River Wharfe is a river in Yorkshire, England and is 60 miles long.
the river nile it is 6695 km long
The Missouri River is 2,341 miles long and is the longest tributary to the Mississippi River.
River crouch is 17.5 miles long
The Benue River Is 1400 Km Long
The Roe River is 12.6 meters long!
The Ebro river is 298 km long.