Mbh 9.37.3b

The river Sarasvati beheld, O monarch, that large body of Rishis penetrated with despair and plunged into anxiety for want of a broad tirtha wherein to perform their rites. For their sake, that foremost of streams came there, having made many abodes for herself in that spot, through kindness for those Rishis of sacred penances, O Janamejaya! Having thus, O monarch, turned her course for their sake, the Sarasvati, that foremost of rivers, once more flowed in a westerly direction, as if she said, 'I must go hence, having prevented the arrival of these Rishis from becoming futile!' This wonderful feat, O king, was accomplished there by that great river. Even thus those receptacles of water, O king, were formed in Naimisha. There, at Kurukshetra, O foremost of Kuru's care, do thou perform grand sacrifices and rites! As he beheld those many receptacles of water and seeing that foremost of rivers turn her course, wonder filled the heart of the high-souled Rama. Bathing in those tirthas duly and giving away wealth and diverse articles of enjoyment unto the Brahmanas, that delighter of Yadu's race also gave away diverse kinds of food and diverse desirable articles unto them. Worshipped by those regenerate ones, Vala, O king, then set out from that foremost of all tirthas on the Sarasvati (Sapta-Saraswat). Numerous feathery creatures have their home there. And it abounded with Vadari, Inguda, Ksamarya, Plaksha, Aswattha, Vibhitaka, Kakkola, Palasa, Karira, Pilu, and diverse other kinds of trees that grow on the banks of the Sarasvati. And it was adorned with forest of Karushakas, Vilwas, and Amratakas, and Atimuktas and Kashandas and Parijatas. Agreeable to the sight and most charming, it abounded with forests of plantains. And it was resorted to by diverse tribes of ascetics, some living on air, some on water, some on fruit, some on leaves, some on raw grain which they husked with the aid only of stones, and some that were called Vaneyas.