Long Dong Bay

Long Dong Bay on Taiwan's northeastern coast is one of the country's most celebrated and accessible dive destinations, a dramatic rocky bay where the coastline's rugged volcanic geology creates an underwater landscape of exceptional character just a short drive from Taipei. This intermediate site draws divers from across Taiwan and beyond for its reliable water clarity, varied marine life, and the distinctive atmosphere of diving along cliffs and rock formations that plunge vertically from the surface into the bay's clear waters. The bay is carved from volcanic rock that forms the northeastern coast of the Gongliao District, its steep walls and rocky formations above water mirrored in the underwater topography below. The submerged cliffs and boulder fields create the three-dimensional habitat structure that supports Long Dong's impressive marine community, with vertical walls providing attachment points for sponges and other sessile organisms and the boulder fields creating the crevice habitat that fish, octopus, and crustaceans depend upon. Long Dong's position at the confluence of two major current systems creates unusual oceanographic conditions that contribute to the site's exceptional biological interest. The Kuroshio Current flows past the northeastern coast, bringing warm, clear tropical water, while mixing with cooler water from the north creates nutrient conditions that support both tropical and temperate species. This biogeographic overlap zone means that divers encounter fish species from both tropical reef communities and cooler-water assemblages in the same dive, creating a species diversity that exceeds what would be found in either pure environment alone. The reef community at Long Dong is characterized by the encrusting organisms that thrive on the volcanic rock substrate. Sponges of various species cover the deeper wall surfaces, while coralline algae and encrusting invertebrates colonize the shallower areas where light exposure favors photosynthetic organisms. Sea anemones with their resident clownfish are found throughout, providing the postcard-perfect Pacific marine imagery that photographers seek. The diversity of nudibranchs found at Long Dong is particularly notable, with the rocky substrate and sponge communities supporting multiple species that reward macro photography enthusiasts. Visibility at Long Dong Bay varies with season and oceanographic conditions but is generally good to excellent during the prime diving season. The northeast monsoon that dominates Taiwan's weather from October through March can create surface chop that complicates entries and exits, but the underwater conditions often remain clear once divers descend below the wave-affected surface layer. Summer months offer the calmest surface conditions and warmest water temperatures. Long Dong Bay's proximity to Taipei makes it uniquely valuable as a training and day-trip destination for Taiwan's large diving community. The combination of genuine dive quality with convenient access has made it a cornerstone of recreational diving in northern Taiwan, a site where many divers have logged their first open-water dives and where experienced divers continue to find rewarding exploration on every visit.