Hydrological exploration in Karst Suaran, Berau, East Kalimantan, Indonesia

Sangkulirang-Mangkalihat is the karst region's identity located on the Mangkalihat Peninsula, on the east side of Kalimantan island. Suaran Karst is a type of karst labyrinth, the typology of karst formed by dissolution in pathways fault, and the fault is more intensive in comparison with other regions. The hydrology expedition in the karst region of Suaran has several objectives, including conducting hydrological observations both briefly and periodically. The discovery of the hydrological and hydrogeological characteristics of the karst region. The various hydrological features found in the Suaran karst region are essential parameters that indicate the uniqueness and importance of the Suaran karst region. The results of the exploration of the karst region of Suaran, found 41 hydrological formations, including springs, pocket valleys, and doline.