After the Vedic Sarasvati dried, new myths about the rivers arose. Sarasvati is described to flow in the underworld and rise to the surface at some places. For centuries, the Sarasvati river existed in a "subtle or mythic" form, since it corresponds with none of the major rivers of present-day South Asia. The confluence ("sangam") or joining together of the Ganges and Yamuna rivers at Triveni Sangam, Allahabad, is believed to also converge with the unseen Sarasvati river, which is believed to flow underground. This despite Allahabad being at a considerable distance from the possible historic routes of an actual Sarasvati river.