Oba Hills Forest Reserve

Oba Hills National Park is a forest reserve and national park in Iwo, Osun State, Nigeria. An enclave surrounded by three hills with a valley running in between, it covers about 52 square kilometres (20 sq mi) of hilly terrain with deep gorges. It has a large teak plantation on its western side, covering about 12% of its total area. Beyond the hills, only coppices are left on the over-exploited plantation.

According to an IUCN report from 2003, about 12% of the reserve has been planted with teak. Some chimpanzee sightings have been reported in the reserve. In 1999, a dead chimpanzee was sold in a local market. A 2009 report said that almost all the reserves had been converted to plantations and farms, with only two gullies remaining forest-covered. It is now believed that chimpanzees are nearly extinct in the reserve.

It is located 253 metres above sea level. The forest ecosystem supports the survival and conservation of several endangered and endemic species. The reserve plays a role in maintaining the ecological balance of the region, helping to regulate the local climate, control soil erosion, and preserve water resources as a natural watershed.

Oba Hills National Park is an area made up of three hills connected by a valley. The northern hill features two gullies on its eastern side with a small area of surviving forest at its peak. The old-growth side of the northern hill has been completely deforested. It is also flanked by a steep drop-off.

The middle hill has two peaks. The northern peak of the middle hill still has forested portions near its summit and slopes. It features one forested area of about twenty-six hectares. It has a gully on its south-facing side with indications of logging and disturbance. The southern peak has been completely deforested. On the reserve's western side which is beyond the hills, there is a sizeable teak plantation that makes up roughly 12% of its whole area. Re-generation of this area is impeded by repeated fires during the dry season. Due to the demand for land and resources that result from the combined increased local population, human interaction, and economic difficulty, local conservation efforts have been jeopardized.