Southwest Pinnacle, Koh Tao: Offshore Granite Formations

Southwest Pinnacle is a deep-dive site characterized by a major rocky pinnacle surrounded by smaller granite outcrops extending to the east and west. These formations create a varied underwater landscape of different depths, swim-throughs, and open areas as they rise from a sandy bottom. The upper sections of the pinnacles provide varied dive profiles and explorations across their slopes and ledges.

The site's topography, often likened to an underwater mountain range with seven distinct peaks, provides shelter and feeding grounds for a wide array of marine life. The clear, bright white sand surrounding the pinnacles enhances visibility and reflects sunlight, illuminating the vibrant ecosystem. Debris fields scattered deeper on the southwest side offer additional exploration points, often revealing larger, more secretive inhabitants like impressive giant green moray eels.

Beyond the main pinnacles, a 'Secret Pinnacle' lies about 120 degrees from the eastern buoy, offering a quieter experience. Here, you can find various reef fish such as boxfish, numerous nudibranchs, and clownfish, making it suitable for macro observation in addition to the larger pelagic draws of the main site.

The granite formations themselves are carpeted with sea anemones, giving the site its local nickname, 'Anemone Pinnacle'. These anemone gardens, vibrantly colored, host numerous clownfish and provide rich photographic opportunities. Interspersed with these are soft corals and hard coral growth, especially on the deeper sections, where gorgonian fans and barrel sponges add to the structural complexity.

Southwest Pinnacle is particularly renowned for its pelagic activity. Large schools of yellowband fusiliers, snappers, trevally, and barracudas are common sights, often forming dense 'cascades' of fish around the pinnacles. These congregations frequently attract larger predators, and dynamic chases between hunters and prey are a regular occurrence, providing a raw ocean experience.

The site is also a known location for whale shark sightings, particularly during peak seasons. While not guaranteed, the possibility of encountering these impressive filter feeders adds to the allure, as they sometimes pass directly through the site. Other larger species observed here include giant groupers, reef sharks, blue-spotted stingrays, and various tuna species, contributing to the feeling of an open-ocean environment despite being relatively close to Koh Tao.