Batu Apoi Forest Reserve is located in Batu Apoi in the Temburong District of Brunei. The Ulu Temburong National Park is located within the reserve.[1] Its mountains reach altitudes of 1,000 metres (3,300 ft) around its southeastern borders. The region features the shale lithology known as Setap Shale, and sometimes as Temburong Formation. River channels, V-shaped valleys, and mixed Dipterocarp rainforest also characterize the forest reserve.[2]
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