Its name derives from the Old English word Belge and means the "Roaring River".

[1] The Belah is formed by the confluence of several small streams or sikes draining most of north and south Stainmore close to the border with County Durham and Yorkshire.

Having washed by Brough Sowerby, the Belah combines its waters with those of the River Eden near to the village of Great Musgrave.

[3] The Stainmore Railway crossed the river on the huge iron-girder lattice Belah Viaduct, before it was demolished in 1964.

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