Longdong (Dragon Cave) Northeast Coast
Overview
Longdong occupies a dramatic stretch of Taiwan's northeast coast where volcanic sandstone cliffs drop into the Pacific, creating sheltered coves and rocky reefs roughly one hour from Taipei. For generations of Taiwanese divers, Longdong is where diving begins. It is the island's most popular training site, the place where most certifications are earned, and for many, the first glimpse of the underwater world. The geology creates a natural amphitheatre. Towering sedimentary rock walls curve around a bay protected from the northeast monsoon. Within the bay, coves provide progressively deeper water over rocky substrate, ideal for structured dive training. The main entry is a concrete ramp at the Longdong Bay Ocean Park, with changing facilities and equipment rental. Beneath the surface, the rocky reef supports a temperate marine community richer than first impressions suggest. Boulder fields create overhangs, crevices, and swim-throughs sheltering impressive invertebrate populations. Octopuses are common, and nudibranchs are abundant and diverse across the site's microhabitats. The real magic happens during summer when the Kuroshio Current pushes subtropical water close to shore. Tropical visitors appear: butterflyfish, angelfish, and occasional moorish idols add unexpected colour to the temperate reef. Cuttlefish hover in the water column, scorpionfish sit motionless, and patient divers find seahorses clinging to soft corals on the outer wall sections. Longdong's proximity to Taipei gives it significance beyond its marine merits. It is the gateway through which Taiwan's growing diving community passes, and weekend mornings during summer see dozens of groups entering the water, creating a communal atmosphere that is part of Longdong's character. For visiting divers, it may not rank among the world's great sites, but as an introduction to Taiwan's marine environment and diving culture, it is indispensable.
Marine life
Dive profile
DEPTH PROFILE
DEPTH PROGRESSION & WAYPOINTS: Longdong (Dragon Cave) Northeast Coast
Location
Frequently asked questions
How do I get to Longdong from Taipei?
Longdong is located within the Northeast Coast National Scenic Area, approximately one hour from central Taipei by car. Public transport options include taking the Taiwan Railways Administration train to Ruifang station, then transferring to a local bus along the coastal road. Several Taipei-based dive shops run regular day trips to Longdong with transportation included, departing early morning and returning by evening. The site has parking areas, changing facilities, and the Longdong Bay Ocean Park provides additional infrastructure including rinse stations and equipment storage.
Is Longdong suitable for diving in winter?
While diving at Longdong is possible year-round, winter conditions from November through March are challenging. Water temperatures drop to 18 degrees Celsius or lower, the northeast monsoon brings significant wave action and reduced visibility, and marine life activity decreases. The prime season runs from May through October, with July to September offering the warmest water and best visibility. During summer, tropical fish species carried north by the Kuroshio Current make temporary appearances, adding unexpected colour to the temperate reef community.
What certification level is needed for Longdong?
Longdong is widely used as a training site for Open Water certification courses, making it suitable for complete beginners under instructor supervision. The sheltered bay areas offer shallow, calm conditions ideal for skill practice, while the outer reef edges provide more interesting terrain for certified divers. Many of Taiwan's PADI and SSI instructors conduct their open water training dives at Longdong due to the combination of easy shore access, gradual depth progression, and sufficient marine life to keep students engaged. Certified divers will find the outer walls and boulder fields more rewarding.
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Data Provenance
This profile is compiled from 3 operator submissions and 142 community logs. Key facts (depth, entry) are verified against official hydrographic charts.