50.

Bachalpsee or Bachsee is a lake with an area of 8.06 ha (19.9 acres) close to the First (which can be reached with a cable car) above Grindelwald in the Bernese Oberland, Switzerland. The lake, located at an elevation of 2,265 m (7,431 ft), is split by a natural dam, the smaller part of the lake being 6 m (20 ft) lower.