The coastline at Longdong is composed of distinct thick-bedded sandstone that dates back to the Eocene epoch.
The name 'Longdong' translates literally to 'Dragon Cave', referring to the curved, dragon-like shape of the bay's shoreline.
Longdong represents one of the largest and most stable rock climbing areas in Taiwan, integrated directly into the snorkeling cliff geography.
The water clarity is significantly higher than other nearby coastal regions due to the lack of river sediment runoff into the specific bay area.
Local marine ecosystems are influenced by the Kuroshio Current, which brings warm water and diverse tropical species to the North Coast during summer months.
Longdong Snorkeling, located in the Gongliao District, is a premier site for marine observation due to its unique geological formations and clear coastal waters. The area is defined by massive, 35-million-year-old sandstone cliffs that form deep, sheltered bays perfect for swimming and diving. The ecosystem here is characterized by a high diversity of reef fish, hard corals, and sea urchins thriving in the rocky intertidal zones. The site features naturally formed tidal pools and inlets protected from open-sea currents. Visitors frequently observe parrotfish, damselfish, and occasionally sea turtles in the deeper channels. The facility provides access to equipment rentals and basic infrastructure for those venturing into the North Coast's most renowned aquatic environment.
The elevated cliffs overlooking the bay at the start of the Longdong Bay Coastal Trail.
Bring reef-safe sunscreen to protect the fragile coral ecosystem.
Wear hard-soled water shoes, as the sandstone shoreline is extremely abrasive and uneven.
Check the local coastal weather forecast specifically for wave heights; swimming is hazardous during Northeast Monsoon conditions.
Attempting to swim in the outer channels during high tide or heavy wind, as strong currents can sweep swimmers toward open water.
Operations are highly seasonal; water activities are effectively closed during the winter months (November to April) due to rough seas and hazardous wave conditions.
Avoid stepping on or touching the coral reefs; use only designated entry and exit points to minimize environmental impact.
