Ang Thong National Marine Park: exploring Phangan's sheltered reefs

Ang Thong National Marine Park, meaning “Golden Urn” in Thai, is an archipelago of 42 islands located west of Koh Phangan. The topography here is distinct, characterized by numerous overhangs and approachable swim-throughs, with sloping reefs that begin at a comfortable 2 metres depth. These formations create a complex labyrinth where light plays intriguing tricks, shifting as you navigate the underwater landscape. It's a site that rewards observation, with plenty of nooks and crannies for resident marine life.

Among the most frequented dive zones within the park are Koh Yippon and Hin Yippon, both known for their accessible shallow caves and extensive swim-throughs. The entry points into these features are typically well-defined, allowing for smooth navigation. While exploring, pay attention to the rich soft coral gardens, particularly the sea fan and black coral formations, which thrive in these sheltered environments and provide ample shelter for smaller reef dwellers. The natural structure of these islands creates a series of protected pockets.

The resident fauna includes a variety of reef fish that thrive in these calm, clear conditions. You will commonly encounter butterflyfish navigating the corals and beaked coral fish darting through the water. Lionfish are also present, often found tucked into the crevices of the reef. The protected nature of the park also makes it a reliable spot for observing banded sea crates (Laticauda colubrina) and frequently, sea turtles (Chelonioidea spp.) moving gracefully through the water column or resting on the sandy bottom.

Sites such as Koh Yippon and Koh Wao stand out for their shallow, protected reefs, which are ideal for a relaxed pace. These areas are nurseries for a vibrant community of colourful reef fish, including parrotfish and angelfish, which are always a highlight. Rays, specifically stingrays (Dasyatidae spp.), are also regularly seen gliding over the sandy patches, often partially buried as they rest, providing a different dimension to the usual reef exploration. The absence of strong currents allows for extended observation time.

Diving in Ang Thong offers an experience distinct from the deeper, often more current-swept sites in the wider region. The focus here is on the intricate reef ecosystems and the interaction within the sheltered environments. The shallower depths combined with the topographical features mean light penetration is generally good, enhancing the colours of the corals and the activity of the fish. It’s an opportunity to slow down and appreciate the smaller details of the reef system without battling strong offshore conditions.