Lake Meke is a volcanic crater lake
composed of two nested lakes located in Konya Province, central Turkey. It is a registered natural monument of the country and a Ramsar site.
Lake Meke is located in Karapınar district of Konya Province. It is 9 km away from Karapınar, and 2 km south of the Konya-Adana highway E981.
It was formed by the flooding of the crater of an extinct volcano, which took shape about 4 million years ago when the volcano erupted. About 9,000 years ago, a second eruption formed another volcanic cone inside the lake with a maar. Lake Meke now consists of two lakes with various islets.
Wikipedia https://en.wikipedia.org/wiki/Lake_Meke
Coordinates 37°41'13.353" N 33°38'35.551" E