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Matang Keladang Lake in the Tawing Lama Village, Aranio, Banjar District, South Kalimantan is lake on the top of Meratus Mountain. This lake is striking NE-SW and icluding in the ultra mafic lithology at 152-135 years ago. This lake are formed together with Meratus Mountain formed at 150 years ago of collision interaction without the eastern of Sunda Land with Pasternoster micro continent. Juring the collision formed the horst and graben in Meratus Mountain contrlled by strike slip fault and reverse fault with striking NE-SW. One of graben who in fill of rain fall to be formed of Matang Keladang Lake (Raja Lima). The beauty of the Matang Keladang Lake (Raja Lima Lake) among others; the hills in the lake are formed by mafic and ultramafic rocks and not limestone; this lake is in the top of the Meratus Mountains. On some hills inside the lake, grows a very large kayu besi (ironwood) trees specific in Kalimantan. The other beauty, from one of the hills that bordered of the lake we can see sun rice in the morning and sun set in the evening, if the weather is nice. Therefor Raja Lima Lake we can lift it as one of geosite in the South Kalimantan Geopark, and can be developed as a leading tourism object in this Geopark. This is supported by paved roads to the location of the lake and ease of transportation.