Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Pācīna Suttā
Pācīna Suttā:A group of three suttas,in all of which it is stated that just as certain rivers (e.g.Gangā,Yamunā,Aciravatī,etc.) tend to flow eastward,so the monk who cultivates the Noble Eightfold Path tends to Nibbāna.S.v.38f.