The Yavyavati is a river of ancient India

Indian subcontinent

The Indian subcontinent, also Indian Subcontinent, Indo-Pak Subcontinent or South Asian Subcontinent is a region of the Asian continent on the Indian tectonic plate from the Hindu Kush or Hindu Koh, Himalayas and including the Kuen Lun and Karakoram ranges, forming a land mass which extends...

, mentioned in the Rigveda

Rigveda

The Rigveda is an ancient Indian sacred collection of Vedic Sanskrit hymns...

 (in RV 6.27.6) and in the Pancavimsa Brahmana (25.7.2). In the Pancavimsa Brahmana the river is associated with the Vibhinduka region (Kuru-Pancala region).

Witzel (1995) identifies it with the Zhob river

Zhob River

Zhob River is located in Balochistan, Pakistan. The name is Iranic in its origin and etymologically identical to those of the Little Zab and Great Zab rivers in Iraq and the Pamirs....

 in northern Baluchistan

Balochistan (region)

Balochistan or Baluchistan is an arid, mountainous region in the Iranian plateau in Southwest Asia; it includes part of southeastern Iran, western Pakistan, and southwestern Afghanistan. The area is named after the numerous Baloch tribes, Iranian peoples who moved into the area from the west...

, while Talageri (2000) suggests that it is identical to the Drsadvati.