 As a result the Tonle Sap River (length around 115 km/71 mi) flows six months a year from southeast (Mekong) to northwest (Tonle Sap lake) and six months a year in the opposite direction in a system of extreme hydrodynamic complexity in both time and space.The Ganges is the sacred river of many religions in India, especially the Hindus.As the Ganges does not flow through Cambodia, the Tonle Sap river has been considered the local sacred river.