Main Ridge is the main mountainous ridge on the Tobago, Trinidad and Tobago island. It is a 29-kilometre (18 mi) chain of hills which runs from southwest to northeast between the Caribbean Sea and the Southern Tobago fault system and reaches a maximum height of 572 m (1,877 ft). The Main Ridge Forest Reserve, which was legally established in 1776, is one of the oldest protected areas in the world. It is a popular site for birdwatching and ecotourism.

The Main Ridge Forest Reserve is home to several flora and fauna, it is estimated that the rainforest provides habitats for twelve to sixteen species of mammals out of the nearly ninety mammal species in the Caribbean region, twenty-four non-poisonous snakes, sixteen lizards and two hundred and ten species of birds, the most outstanding being the bird species Campylopterus ensipennis - the White-tailed Sabrewing Hummingbird - that is both rare and endemic to Tobago. After the 1963 hurricane Flora, many flora and fauna populations dwindled or disappeared. The Sabrewing Hummingbird is one of the species that has been recovering since the incident. Trinidad and Tobago's Environment Management Authority declared the bird an Environmentally Sensitive Species in 2005. The ridge is also home to the ocellated gecko, an animal that is not found anywhere else in the world.