By their modeling, the valleys of the Venezuelan territory belong mainly to two types: valleys of fluvial type and valleys of glacial type. Much more frequent, the former largely dominate the latter, which are restricted to the highest parts of the Andes. Moreover, most glacial valleys are relics of a past geologic epoch, which culminated some 10,000 to 12,000 years ago. They are frequently retouched today by fluvial events. Consequently, any attempt to typologize the Venezuelan valleys, based exclusively on the characteristics of their modeling, would be quite elementary.