In 1999, Lake Sentarum designated as a National Park by the Indonesian government that is representative of freshwater swamp forest ecosystem and the tropical rain forest in Borneo. Lake Sentarum is a seasonal lake that lies in the Kapuas river basin. Sentarum Lake is the regulator of the water system for the Kapuas River Basin and also as a water catchment area. Lake Sentarum located downstream of the Kapuas River and depending on fluctuations of amount water collected in the lake. Distinctive and original plants in Sentarum Lake National Park are "Tengkawang" (Shorea beccariana) and also other plants such as "Meranti" (Shorea sp.), "Jelutung" (Dyera costulata), "Trembesi" (Eusideroxylon zwageri) and "Ramin" (Gonystylus bancanus).
Aquatic systems from freshwater lakes and flooded forests makes Lake Sentarum different from any other lakes. The water was coloured dark reddish because they contain tannins derived from peat in the surrounding forest. During the rainy season, the depth of the lake water could reach 6-8 meters and cause flood surrounding forest. However, throughout the dry season, the place that the water level in Sungai Kapuas gradually decreased, water from Lake Sentarum will flow into the Kapuas River so that water in the river discharge is relatively stable. Finally at the peak of the dry season, state Sentarum Lake and the area will become a large expanse of land. The fish that had been on the lake, will be noticed in small pools.
People's lives around the national park which tribe Dayak Iban, Sebaruk, Sontas, Kenyah and Punan still traditional. Longhouse (betang) which isinhabited by tribes are diverse in space, you will discover five to eight inhabited and there are heads of homes are occupied by 15 to 30 heads of homes. Longhouses lived on by 15-30 heads of families, have an average length of 186 meters and 6 meters wide. Life at home betang show a a harmonious relationship, innocence and the hospitality of the tribe, and usually tourists will be treated to dance Dayak. Point of tourism interest to visit is Mount Lanjak, Nanga Kenelang and Bukit Tekenang where we can see a scene of the lake, boating and bird and animal observation equipped research laboratory facilities.
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