Marmara Lake which extends from 10 to 11 km from east to west and has a width of about 3 to 5 km covers an area of 56 km2 and is 79 m. above sea level. In 1951, the water of the Gördes and Kum Rivers were led to the Marmara Lake which is a tectonic and shallow lake. The waters of the Gediz River are controlled, passing through the Adala Regulator. Today the water from the Marmara Lake is used for irrigation of the agricultural areas near Ahmetli district within the scope of the General Directorate of State Hydraulic Works. The lake also feeds the Menemen plain. The South-Eastern edge of the lake is elevated and a regulator has been made for use in watering. During the winter months, additional water from the Kum River and from the Demirköprü Dam are transferred to the lake. Moreover, the water is transferred through the Marmara Lake Regulator to Gediz.
Marmara Lake was registered as an important wetland area in 2017 by the commission of the National Wetland Areas. The lake serves as an important wet land area for the feeding, sheltering and breeding of many bird species. It hosts 101 of the 421 bird species in Turkey. 39 of these species are local, 38 are summer migrants, 17 are winter migrants and 5 species are birds in transit. The Marmara Lake is the breeding area of the Dalmatian pelican which is in the LR list of the International Union for Conservation of Nature and Natural Resources Commission. The fish population of the lake is also significant. Among the fish species in the lake are: Cyprinuscarpio, Sanderlucioperca, Mugucephalus and Salmotrutta. The fish caught in the lake are sold by the Gölmarmara and Surrounding Aquaculture Production and Evaluation Cooperative. The lake has 394 plant species, 5 of which are endemic.
Geoparks are special nature conservation areas, where different or the same type of geological heritage of international importance are located, managed and planned. Elements that explain the formation of the earth's crust, representatives of a known event, rare or extremely large formations are defined as geological heritage.