Turtle Islands

Turtle Islands Park comprises three small islands, Selingan, Bakkungan Kecil, and Gulisan, located in the Sulu Sea approximately 40 kilometers north of Sandakan in eastern Sabah. Covering a combined area of just 1,740 hectares including surrounding marine territory, the park protects one of the most important green and hawksbill turtle nesting sites in Southeast Asia. Established in 1977, the park has operated a continuous turtle conservation program that has monitored and protected nesting turtles and their eggs for over four decades. Selingan Island, the only island open to overnight visitors, offers the remarkable experience of witnessing sea turtles coming ashore to nest and hatchlings being released into the sea.

Green turtles are the primary nesting species, with females hauling themselves onto the beaches nightly throughout the year, though nesting activity peaks from July to October. Hawksbill turtles also nest on the islands in smaller numbers, with their beautiful shell patterns distinguishing them from the larger greens. The surrounding waters support coral reef fish communities, and the shallow reefs around the islands provide foraging habitat for resident turtle populations. Seabirds including terns nest on the less-disturbed islands, and fish eagles hunt over the surrounding waters. Monitor lizards inhabit the island interiors, and their egg-raiding behavior is one reason the turtle conservation program relocates eggs to protected hatcheries.

The small islands support limited but characteristic coastal vegetation including casuarina, coconut palms, sea almond, and beach morning glory that stabilize the sandy shoreline. The island interiors host secondary tropical forest with a canopy of mixed species adapted to the sandy, salt-influenced soils. Coastal scrub and ground-cover vegetation on the beach margin provide some shade for nesting turtles during the laying process. The marine environment surrounding the islands includes patch reefs with coral species that provide habitat structure for the reef fish community. Seagrass beds between the islands serve as important feeding areas for the resident green turtle population.

The Turtle Islands are coral sand cays formed by the accumulation of coral fragments, shell material, and sand on the shallow continental shelf of the Sulu Sea. The islands are low-lying, with maximum elevations of only a few meters above sea level, making them vulnerable to erosion and sea level changes. The underlying coral reef platform provides the foundation on which sediment has accumulated to form the islands. Beach sand is predominantly composed of coral and shell fragments ground by wave action, with the fine-grained material providing the substrate in which turtles excavate their egg chambers. Coral reef formations surrounding the islands create a protective barrier that moderates wave energy and maintains the beaches.

The islands experience a tropical maritime climate with consistently warm temperatures between 26 and 32 degrees Celsius and minimal seasonal variation. Annual rainfall is moderate at approximately 2,000 millimeters, with the northeast monsoon from November to March bringing slightly wetter conditions and occasionally rough seas. The Sulu Sea's relatively sheltered position provides calmer conditions than the open South China Sea coast, making boat access more reliable year-round. Water temperatures remain between 27 and 30 degrees Celsius, favorable for both coral growth and turtle nesting. Tidal patterns influence beach width and turtle nesting timing, with most females coming ashore during high tide when the crawl distance to suitable nesting substrate is shortest.

The Sulu Sea islands have been known to seafaring peoples for centuries, with the Bajau Laut and Suluk communities of the region utilizing the surrounding waters for fishing and sea cucumber harvesting. The turtle islands were historically harvested for eggs by both indigenous communities and commercial collectors, with turtle eggs considered a delicacy and an important protein source in the region. Egg collection was a regulated concession during the colonial period and early independence, with the transition from harvesting to conservation reflecting changing attitudes toward wildlife management. The security situation in the Sulu Sea, where maritime piracy and cross-border incursions occur, has occasionally affected park operations and visitor access.

Turtle Islands Park was gazetted in 1977, making it one of the earliest marine protected areas in Malaysia and a pioneer in sea turtle conservation in Southeast Asia. The park's establishment ended commercial egg collection on the three islands and initiated the hatchery program that has protected millions of eggs over the subsequent decades. The park was the first protected area in Malaysia specifically designed for sea turtle conservation and has served as a model for similar programs throughout the region. The long-running dataset of nesting activity, egg production, and hatchling release rates provides one of the most comprehensive records of green turtle reproductive biology anywhere in the world.

The central experience at Turtle Islands is witnessing a green turtle laying eggs on the beach at night, guided by park staff who locate nesting females and bring small groups of visitors to observe the process. Following egg-laying, visitors may observe eggs being collected by rangers for transfer to the protected hatchery, where they are reburied in sand at optimal conditions. Hatchling release ceremonies, where hundreds of tiny turtles are guided to the sea's edge, provide an emotional conservation experience. Daytime activities include snorkeling on the surrounding reefs, walking the island's beach perimeter, and visiting the park's small interpretive center. The simplicity of the island experience, focused entirely on the turtles and the marine environment, creates a uniquely immersive conservation encounter.

Only Selingan Island is open to overnight visitors, with basic chalet accommodation limited to approximately 40 guests per night to minimize disturbance to nesting turtles. Permits must be arranged through licensed operators in Sandakan, and advance booking is essential as the small capacity fills quickly. The boat journey from Sandakan takes approximately one hour, departing in the afternoon and returning the following morning. Meals are provided in a communal dining hall, and facilities are basic but adequate. Sandakan is accessible by air from Kota Kinabalu, with a 45-minute flight being the most convenient connection. Crystal Quest, the primary tour operator, manages bookings and logistics for most visitors.

The hatchery program has relocated and protected millions of turtle eggs since the park's establishment, contributing to the maintenance of green turtle populations in the Sulu-Sulawesi Seas region. However, conservation scientists debate whether hatchery-based programs produce sex ratios that reflect natural beach conditions, as sand temperature determines hatchling sex. Poaching of eggs from unprotected beaches elsewhere in the region undermines the park's conservation gains, as turtles nest across a wide geographic range. Climate change poses threats through rising sea levels that could reduce nesting beach area and increased sand temperatures that could skew hatchling sex ratios toward all-female populations. The park's long-term data record provides essential information for understanding trends in turtle reproductive success and informing conservation management across the species' range.