1. Omo Forest Reserve
- State: Ogun
- Size: 1,192 hectares
- Established: 1911
- Notable features: The reserve is home to a diverse range of plant and animal species, including endangered species such as the chimpanzee and the white-throated guenon.
2. Osse Forest Reserve
- State: Edo
- Size: 1,720 hectares
- Established: 1912
- Notable features: The reserve is known for its rich biodiversity and is home to several rare and endangered plant and animal species. The forest is also a popular spot for birdwatching and nature walks.
3. Oban Hills Forest Reserve
- State: Cross River
- Size: 3,010 hectares
- Established: 1916
- Notable features: This tropical forest reserve is known for its high levels of biodiversity and is home to many rare and endangered plant and animal species. It is also the site of the tallest mountain in Nigeria, Mount Cameroon, which rises to 4,070 metres above sea level.
4. Gashaka Gumpti National Park
- States: Adamawa, Taraba
- Size: 6,402 square kilometres
- Established: 1991
- Notable features: Gashaka Gumpti National Park is one of the largest national parks in Nigeria and is home to a diverse range of plant and animal species. The park is also home to the endangered mountain gorilla and the Nigerian dwarf crocodile.
5. Cross River National Park
- State: Cross River
- Size: 4,000 square kilometres
- Established: 1991
- Notable features: Cross River National Park is located in the rainforest region of Nigeria and is home to a wide variety of plant and animal species. The park is also home to several endangered species, including the drill monkey and the elephant.