Agathis orbicula is a coniferous tree that belongs to the family Araucariaceae. The species epithet is derived from the Latin word, orbicularis meaning circular, this refers to the leaf shape of this species. It can grow up to 40 m tall. The shape of the juvenile leaves is ovate, measuring up to 6.5 x 2.8 cm, the apex of the leaves is bluntly acute. Meanwhile, the shape of the adult leaves appears ovate to orbicular, measuring up to 4 x 2.4 cm, it is broadly rounded to slightly angled at the apex, tapering toward the base. The male cones are very small and cylindrical, measuring up to 1.4 cm long and up to 6 mm wide. On the contrary, the female is ovoid-shaped, measuring around 7 x 4.5 cm. It is known as bulok by Iban, tubu by Kenyah and Kayan, and tumuh by Murut ethnic. This species is endemic to Borneo. It is distributed in sandstone kerangas forest at 450 to 1,050 m (Yii, 1995).