Lamandau River
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| Lamandau River Sungai Lamandau, Sungai Kotawaringin | |
|---|---|
 | |
  River mouth location  Lamandau River (Indonesia) | |
| Location | |
| Country | Indonesia |
| Physical characteristics | |
| Source | |
| • location | Kalimantan |
| Mouth | |
• location | Java Sea |
| Length | 300 km (190 mi) |
Lamandau River (Indonesian: Sungai Lamandau) is a river of Kalimantan, southern-central Borneo, Indonesia.[1][2] Downstream after passing the village of Nanga Bulik it becomes the Kotawaringin River.[3]
The ancient town of Kotawaringin is located in the valley formed by the river and its tributary along with gold and gemstone mining areas. In the upper reaches of the tributary valley of Arut River the Pangkalan Bun town flourishes on its banks.
Lamandau River flows through southern Central Kalimantan and Pangkalan Bun, discharging into the Java Sea near Kumai at 2°51′20″S 111°43′14″E / 2.85556°S 111.72056°E. It is a major tributary of the Kotawaringin River, known by this name after its confluence below Naga Bulik village. Tributaries include the Arut River, where in its upper reaches the Pangkalan Bun town is located. While the lower reaches of the river are densely populated, the upper reaches have contiguous forest areas where Orangutans can be seen.[3] Kotawaringin town to the west of the Lamandau River was the ancient capital of a Sultanate.[4]
The catchment of the Lamandau River comprises the western district of Central Kalimantan and West-Kotawaringin. West Kotawaringin district has a population of 200,000 people constituted by Tuman Dayaks (about 33%) who are Christians. The capital of this district is Pangkalan Bun, which has a sub-district, a traditional area of the Dolang, close to the Kundangan city where 7000 Dayaks reside in about 100 longhouses spread over 19 villages.[5]
Pangkalan Bun town is a waterfront town, which has a plywood manufacturing plant. Its fame is due to the mines nearby where gold and amethyst stones are extracted. In support of these mining activities, several shops selling diesel sets for use in mining have been set up. Another spin-off from the mines is the establishment of several gem stores in the town. The particularly popular item of sale is the five-set lucky stones of dark coloured amethysts, duly polished and made to shimmer for sale.[6]
Geography
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The river flows in the mid-southern area of Borneo island with a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).[8] The annual average temperature in the area is 23 °C. The warmest month is October when the average temperature is around 24 °C, and the coldest is January, at 22 °C.[7] The average annual rainfall is 2778 mm. The wettest month is November, with an average of 386 mm of rainfall, and the driest is September, with 66 mm of rainfall.[9]
People in the valley
The river valley is inhabited by the Dayak peoples, particularly the Tumon in the upper course of the river. The river is popular with tourists who take trips along the rivers by speedboats and traditional klotok boats to visit and experience the lives of the Dayaks. Buddhist influence has also been traced to the Lamandau River valley in Kotawaringin town. Buddhist statues with the god's name of Dewata or Mahatara have been found here.[10]
Agriculture
Much of the land between the Jelai-Bila River and the Lamandau River is developed by agriculture.[3]
