Buchanania obovata is a small to medium-sized understorey tree in woodlands native to northern Australia, in particular in Arnhem Land in the Northern Territory. Common names include green plum and wild mango.
Leaves are smooth, thick, leathery, broadly oblong, 5–25 centimetres (2.0–9.8 in) long and 1.5–10 centimetres (0.59–3.94 in) wide. Flowers are small, cream-coloured and 0.5 centimetres (0.20 in) across. The fruit is smooth, fleshy, lens-shaped, 1–1.7 centimetres (0.39–0.67 in) long.
The species was formally described in 1883 based on plant material collected from Escape Cliffs in the Northern Territory by C. Hull.