Ba Bể Lake (, Ba Bể meaning "Three Lakes" in the local Tay language) is the largest natural fresh water lake, stretching about 8 kilometers in the north-south direction. The surface area of the lake fluctuates between 3 and 5 km2 between dry and wet season. Unlike many lakes in Karst limestone areas, Ba Bể Lake never falls dry.
Ba Bể Lake is a significant natural body of water located in an area known as "Three Lakes" in the local Tay language. It measures around 8 kilometers from north to south and has a surface area that fluctuates between 3 and 5 square kilometers depending on the season. Unlike other lakes in similar geological settings, Ba Bể Lake remains filled with water year-round.