It is located in Nam Mẫu commune, Ba Bể district, Bắc Kạn Province in the Northeast region of the country.

Having been formed approximately 200 million years ago, the lake is surrounded by limestone cliffs, which in turn are covered by primary forests.

Three rivers, named Năng, Tả Han, and Nam Cường, are the main inflows of the lake.

The Năng river enters the lake through a large waterfall called Đầu Đẳng.

The village was subsequently submerged in water and gradually formed into the current Ba Bể Lake.