or Dembe'a. A lake in Gojam, Abyssinia, the source of the Blue Nile. Captain Speke traced the White Nile to Lake Victoria N'yanza, which, no doubt, is fed by the Mountains of the Moon.
He [the Nile] thro' the Incid lake Of fair Dambea rolls his infant stream.
Thomson: Summer, 807-8.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Dambe'a from Infoplease: