Hanauma Bay

Hanauma Bay is one of the most beautiful and beloved snorkeling spots in Hawai‘i — a sheltered, curving bay cradled in an ancient volcanic crater on the southeast shore of O‘ahu, not far from Honolulu and Waikīkī. Its clear, calm, shallow water over a vibrant coral reef teems with colorful tropical fish and sea turtles, making it a magical underwater window for snorkelers of all levels.

A protected marine life conservation area and nature preserve, Hanauma Bay was once so loved that it was nearly destroyed by overuse; now carefully managed (with limited entry, reservations, an education program and rest days), it has recovered into a thriving reef. Visitors descend to the curving sand beach to snorkel among the fish, parrotfish, butterflyfish and green sea turtles. Sheltered, vibrant and protected, Hanauma Bay is a treasured natural icon of Hawai‘i.

Hanauma Bay is all about snorkeling — the sheltered, shallow, clear water over the reef is ideal for viewing tropical fish, parrotfish, butterflyfish, the state fish (humuhumunukunukuāpua‘a) and green sea turtles, even for beginners (gear rental and an orientation are available). Visitors also swim, relax on the curving sand beach, and learn at the education center (a video orientation is required before entering). Snorkeling the vibrant reef and relaxing on the beach are the signature draws. The combination of a sheltered, beautiful bay and an accessible coral reef makes Hanauma a premier snorkeling destination.

The bay is enjoyable year-round, with the calmest, clearest water and best snorkeling generally in the morning before winds pick up; mornings are also the way to secure entry, as the preserve limits the number of visitors and uses reservations (and is closed on certain days for the reef to rest). Summer often brings the calmest conditions. Mornings, with a reservation, are the highlight — arrive early (or reserve online), come on an open day, and snorkel in the morning calm; check the schedule, as the preserve closes some days each week.

Hanauma Bay is significant in Native Hawaiian history and tradition (a place of fishing and, by legend, of royalty). By the late 20th century, its fame drew so many visitors that the reef and fish were badly degraded. In response, the City and County of Honolulu transformed it into a carefully managed nature preserve — limiting numbers, charging entry, requiring an educational orientation, banning fish-feeding, and giving the bay rest days — allowing the reef to recover dramatically, a noted conservation success. Hanauma Bay preserves this beautiful, recovered reef and bay, a treasured icon of Hawai‘i.

Hanauma Bay sits in a volcanic crater — a tuff cone formed by explosive eruptions (when rising magma met seawater) on O‘ahu’s volcanic southeast coast — one side of which the sea later breached, flooding the crater to create the sheltered, curving bay. A fringing coral reef has grown in the calm, shallow water, building the vibrant ecosystem. The volcanic tuff cone, the sea’s breaching of its wall and the growth of the coral reef created this sheltered, life-filled bay.

Hanauma Bay teems with marine life — hundreds of species of colorful tropical reef fish (parrotfish, butterflyfish, tangs, the state fish humuhumunukunukuāpua‘a and many more), green sea turtles (honu) that graze and rest in the bay, eels, octopus, and the corals that build the reef, with seabirds along the cliffs. The protected reef is a thriving haven. Hanauma offers superb, accessible wildlife watching beneath the surface — the tropical fish and the green sea turtles are the unforgettable highlights for snorkelers.

Hanauma Bay is a Marine Life Conservation District protecting a fringing coral reef ecosystem — the corals, the hundreds of fish species, the sea turtles and the web of reef life — in the sheltered crater bay. Its recovery from severe overuse, through strict management (limited numbers, no fish-feeding, rest days, education), is a model of reef conservation, though it remains sensitive to crowding, sunscreen chemicals and a warming, acidifying ocean. Protecting the reef, the fish and the turtles, and managing visitation, sustains both the ecology and the beauty of Hanauma Bay.

Hanauma Bay holds a treasured place among the icons of Hawai‘i — O‘ahu’s premier snorkeling spot, a sheltered, curving bay in a volcanic crater teeming with tropical fish and sea turtles, significant in Native Hawaiian tradition and famous as a conservation success story for its recovery from overuse. Its vibrant reef and calm, clear water embody the underwater beauty of Hawai‘i. Hanauma Bay is a cherished natural icon of Hawai‘i.

Hanauma Bay Nature Preserve is on the southeast shore of O‘ahu, about 10 miles (20–30 minutes) east of Waikīkī along the coast (Kalaniana‘ole Highway). It is managed by the City and County of Honolulu, with an entry fee for non-residents, limited daily capacity and online reservations (which sell out fast), a required educational video before entering, parking (which fills), and gear rental. It is closed on certain days each week (for the reef to rest) and on some holidays. Check the City and County of Honolulu / Hanauma Bay for reservations, hours, closures and fees before visiting.

The City and County of Honolulu protects Hanauma Bay as a nature preserve and Marine Life Conservation District. Visitors help by following all the rules that protect the recovered reef — never touching or standing on the coral, never feeding or chasing fish or turtles (and keeping a distance from the protected sea turtles), using only reef-safe sunscreen (others are banned), staying in allowed areas, watching the required orientation, and packing out everything. The reef, the fish and the turtles are protected and sensitive. Following the rules sustains both the ecology and the beauty of Hanauma Bay.

Snorkel within your ability and stay aware — while the inner bay is usually calm, currents and surge can be strong near the reef edges and the bay mouth (heed lifeguards and flags), and the coral and rocks are sharp. Never stand on the coral (it’s alive and the cuts get infected). Watch for shallow reef and sun (use reef-safe sunscreen and a rash guard). Keep a respectful distance from sea turtles. Don’t snorkel alone. Respect the currents and surge, the sharp coral, the sun, the lifeguard guidance and the protected wildlife.

Entry requires a fee (non-residents), limited reservations (book online ahead), and watching a required conservation orientation video; the preserve is closed certain days for the reef to rest. Do not touch or stand on coral; do not feed, chase or touch fish or sea turtles (keep your distance). Only reef-safe sunscreen is allowed. Stay in permitted areas and heed lifeguards. Smoking and certain items are banned. Pack out all trash. Drones are restricted. Check the City and County of Honolulu / Hanauma Bay for reservations, hours, closures and rules before visiting.

Waikīkī and Honolulu to the west, the southeast O‘ahu coast with its lookouts (Halona Blowhole) and beaches (Sandy Beach, Makapu‘u), Diamond Head, and the windward side beyond lie near the bay. The island of O‘ahu defines the region. Hanauma Bay is O‘ahu’s premier snorkeling spot, a centerpiece of an O‘ahu adventure, easily combined with Waikīkī, Diamond Head and the scenic southeast coast.

Reserve your entry online well ahead (slots sell out fast) and arrive early in the morning for the calmest, clearest water and to secure parking — check that the preserve is open (it closes certain days for the reef). Watch the required orientation video, bring or rent snorkel gear, and use only reef-safe sunscreen. Never touch or stand on the coral and keep your distance from the sea turtles. Heed the lifeguards on currents near the reef edges, and combine your visit with Diamond Head and Waikīkī.