A lake is located in the Mahakam river in Kutai Kartanegara regency, East Borneo, Indonesia. This lake has an area of ​​approximately 13,000 hectares. Semayang lake to the left of the Mahakam River and adjacent to the lake is located on the right Across the Mahakam. Semayang lake located in the Middle Mahakam Region, is one of the largest wetlands environment in Borneo. Biodiversity in the lake environment Semayang high enough, including aquatic and terrestrial biota, as well as abundant water resources to various community activities. It could be said of Semayang lake environment is the zone that has a wealth of germplasm and ecological areas that have potential economic value for a variety of activities. Semayang lake area is surrounded by a river dam lakes and rivers around the stage home residents citizens who are made ​​of wood usually pd dry season the soil is dry and ruptures, who had extensive lake filled with water into a dry and arid. But when the rainy season has arrived, the lake turned into a vast ocean, and even home residents.