The Cūḷavaṃsa (Cv.xxxvii.191) mentions a sutta by this name. The Commentaries on the Dhammapada (DhA.iii.436 ﬀ) and the Khuddakapāṭha (KhpA.162 ﬀ) contain accounts of the visit paid by the Buddha to Vesāli to drive out from there the fears of famine and pestilence, and they describe in great detail the celebrations that took place as the Buddha returned to Rājagaha along the Gaṅgā. This journey is called Gaṅgārohaṇa.
The Sutta mentioned is probably, therefore, the Ratana Sutta (q.v.), which the Buddha taught at Vesāli.