Lake Eymir, used for swimming, fishing and the main drinking water source of the METU campus until 1990s, lost its water quality after the untreated sewage waters of Gölbaşı town was directly released into the Lake beginning from 1970s. In 1995, releasing the direct supply of domestic waste water into Lake Eymir was ceased through Gölbaşı sewage system that was put into effect following the cooperation between METU academics and ASKI authorities. Hence, the first concrete step for the preservation of Lake Eymir was taken under the leadership of METU. Then, "Ecological Monitoring Program" was initiated by METU Department of Biology, Limnology Laboratory established in 1997. Under this program, 50% of the carp and kelp stocks concentrated in the lake were removed from the lake following a controlled fishing process to improve the water quality in Lake Eymir during 1998-1998-1999 under the supervision of METU-Limnology Laboratory. In 20 years after the removal of domestic wastewater from the lake, there has been some significant reduction in phosphorus concentration through biomonipulation and restoration, which were applied twice, one was for a short time, while the other was for a long time. This resulted in an increase in lake water clarity and a decrease in phytoplankton mass to some extent. The restoration of Lake Eymir through biomanipulation is the first successful restoration in our country and even in the Mediterranean climate zone. The Middle East Technical University established "Kemal Kurdaş Ecological Monitoring and Training Station" in Lake Eymir in order to more effectively and actively manage the protection and management of Lake Eymir ecosystem. Limnology Laboratory follows all possible changes in Lake Eymir with "Real Time Automatic Lake Monitoring System" with TUBITAK ÇAYDAĞ support under NETLAKE, which is an European COST Action. Thus the water quality and ecological conditions of the lake will be automatically detected every 10 minutes and the responses given to the extreme events (heat waves, floods, etc.) of the Lake will be modeled and the ecosystem structure and ecosystem values of Lake Eymir will be used to develop more effective protection methods and strategies. Thanks to the studies carried out since 1997, Lake Eymir has become one of the lakes with rare good ecological features and water quality in Central Anatolia.