Kosambi (Pali) or Kaushambi (Sanskrit) was an ancient city in India, characterized by its importance as a trading center along the Ganges Plain and its status as the capital of the Vatsa Kingdom, one of the sixteen mahajanapadas. It was located on the Yamuna River about 56 kilometres (35 mi) southwest of its confluence with the Ganges at Prayaga, which made it a powerful center for trade and beneficial for the Vatsa Kingdom.