Identification of a mighty "physical" Rig Vedic Sarasvati with the Ghaggar-Hakra system is therefore problematic, since the Gagghar-Hakra had dried-up well before the time of the composition of the Rig Veda. In the words of Wilke and Moebus, the Sarasvati had been reduced to a "small, sorry trickle in the desert", by the time that the Vedic people migrated into north-west India. Rig Vedic references to a physical river also indicate that the Sarswati "had already lost its main source of water supply and must have ended in a terminal lake (samudra) approximately 3000 years ago," "depicting the present-day situation, with the Sarasvatī having lost most of its water." Rig Vedic descriptions of the Sarasvati also don't fit the actual course of the Gagghar-Hakra.