Krumme Lanke  To the north east, the Riemeistersee flows into the Riemeisterfenn nature reserve, the Langes Luch nature reserve, the Grunewaldsee and ultimately the Hundekehlesee. Krumme Lanke is 1,100m long with a circumference of 2.5 km, is up to 6.6m deep and has a surface area of 154,000m². A path running along the edge of the lake is popular with joggers and walkers. There are also two bathing spots on the lake, one of which is used for naturism. There is also an exercise area for dogs on the northern bank, although this is currently overgrown. Unlike other lakes in the area, which contain eels, tench, pike, carp, catfish and perch, the Krumme Lanke is home only to asp. On the northern bank is a memorial to Sergeant Fritz Göhrs, who was killed there in 1928. Whilst riding around the lake, Göhrs' horse was startled and threw him into the lake. The horse then fell on top of him and Göhrs drowned. Around a kilometre from the lake is the Krumme Lanke station of the Berlin U-Bahn, on the U3. Having already bought the then villages of Zehlendorf, Schlachtensee and Nikolassee in 1242, the monks of the influential Cistercian Lehnin Abbey sought nine years later to expand their estate further north into Teltow. In 1251, they bought the village of Crumense by the Krumme Lanke for one hundred and fifty marks from the Ascanian Margraves Johann I and Otto III, who ruled the area together. As the village is not recorded in the Land Book of Charles IV of 1375, it is very likely that the village was abandoned soon after the purchase. As excavations in the abandoned site have uncovered remnants of Slavic pottery, it is thought the settlement was originally a Slavonic foundation. "Crumense" in Middle Low German indicates a site by a crooked lake, meaning the village was named after the lake. There are references to the lake itself in documents from 1543 and 1591, in which it is referred to as the "Krummensee". Between 1938 and 1940, the GAGFAH property company built an SS colony by the Krumme Lanke.