Question: is tonle sap a natural lake?
Answer: Tonlé Sap (Khmer: ទន្លេសាប IPA: [tunleː saːp], literally large river (tonle); fresh, not salty (sap), commonly translated to 'great lake') is a seasonally inundated freshwater lake, the Tonlé Sap Lake and an attached river, the 120 km (75 mi) long Tonlé Sap River, that connects the lake to the Mekong River.