Lake Brienz
Interlaken is located at above sea level, between Lake Brienz to the east and Lake Thun to the west on the alluvial land called Bödeli. The town takes its name from its geographical position between the lakes (in Latin "inter lacus"). The Aare flows through the town from one to the other lake, whilst the Lütschine flows from the mountains from the south into Lake Brienz however not running through the municipality of Interlaken.