Numbers 21:30. Mentioned in the Amorites' triumphal song, after recounting the conquest of Heshbon from Moab. Ewald locates Nobah near Heshbon (Numbers 32:35; Numbers 32:42) and identifies Nophah with it.
Bibliography Information Fausset, Andrew Robert M.A., D.D., "Definition for 'Nophah' Fausset's Bible Dictionary". bible-history.com - Fausset's; 1878.