LongDong NO.4

LongDong No.4 at Taiwan's Long Dong Bay on the northeastern coast is an intermediate dive site that represents one of the bay's more varied and interesting underwater environments, descending to twenty-three meters through volcanic rock terrain shaped by the powerful oceanographic forces that have made Long Dong one of Taiwan's most important recreational diving destinations. The site combines the dramatic geology of the northeastern coastline with the biological richness that the Kuroshio Current's influence creates. The terrain at LongDong No.4 features the angular, fractured volcanic rock that characterizes Long Dong Bay throughout, but with a particular arrangement of formations that creates interesting navigation challenges and habitat variety within the site. Vertical walls alternate with sloping reef sections and boulder fields, each habitat type supporting a different community of organisms and requiring different diving techniques to explore effectively. This variety keeps intermediate divers engaged throughout the dive, as the changing terrain continuously presents new perspectives and marine life encounters. The encrusting community on the volcanic rock substrate is one of the site's defining features. Long Dong's rocky surfaces host a rich assemblage of sponges, hydroids, and other encrusting invertebrates that collectively transform the dark volcanic rock into a colorful, textured surface of considerable biological interest. The species composition reflects Long Dong's biogeographic position at the boundary between tropical and temperate Pacific marine ecosystems, with warm-water sponge species common in the Indo-Pacific sharing the substrate with cold-water species more typical of northern Pacific shores. The twenty-three meter depth at LongDong No.4 provides comfortable access to the more interesting deeper sections of the reef while remaining well within recreational diving limits. This depth range is particularly productive for intermediate divers who want to experience the site's ecological depth without the gas management pressure of deeper excursions. The reef at these depths tends to have excellent visibility, particularly when the northeast monsoon has passed and the summer months bring the calmer, clearer conditions that make Long Dong diving most rewarding. Current management is an important skill for diving LongDong No.4, as the tidal flows that sweep Long Dong Bay can be significant during certain phases. The bay's complex topography creates local current variations that experienced divers learn to exploit, using the accelerated flow to drift along productive reef sections and taking shelter in the current shadow of rock formations when rest is needed. This current-reading skill adds an interesting technical dimension to intermediate diving at the site that more sheltered beginner locations cannot provide. LongDong No.4 is a site that grows in quality with each visit, its underwater topography revealing new features and its marine community presenting different species and behaviors as seasons change and divers learn where to look. It represents the substantive, rewarding intermediate diving that has made Long Dong Bay a cornerstone of recreational diving in northern Taiwan.