Lake Te Anau (348 sq km) is New Zealand’s second largest lake after Taupō (606 sq km). It is 212 m above sea level, 61 km long and 276 m at its deepest point. Its three fiords – South, Middle and North – separate the Kepler, Murchison, Stuart and Franklin mountains.
The eastern shore of the lake abuts the Southland Plains. The western shoreline gets 1,700 mm of rain each year, the east around 1,100 mm. Glow-worm caves lie on the west side, between the middle and south fiords. The lake yields both trout and land-locked salmon.
https://teara.govt.nz/en/southland-places/page-11