Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Gangāpeyyāla
Gangāpeyyāla：In the fifth book of the Samyutta Nikāya a repetition under the name of Gangāpeyyāla occurs several times．”Just as the Gangā flows to the east，slides to the east，and tends to the east，even so，a monk who cultivates the bojjhangas （S.v.135，137），the satipatthānas （196），the indriyas （239，241），the padhānas （244），the balas 249，251），the iddhi-pādas （290），and the jhānas （307），slides and tends towards nibbāna.”