Batu Kapal — ship rock in Malay — is the most photographed landmark in Bako National Park. The formation consists of a cluster of sandstone sea stacks rising abruptly from the South China Sea off Bako's southern coastline, the tallest reaching roughly 15 metres above the waterline. Their sheer walls, stained with horizontal bands of iron oxide in orange and rust, and their pointed tops draped with wind-sculpted vegetation, make them one of the most striking coastal features in Sarawak.
The stacks are remnants of the same ancient sandstone that forms the entire Muara Tebas peninsula on which Bako sits. Over millions of years, wave erosion undercut the coastal cliffs, isolating resistant pillars that now stand offshore. The softer surrounding rock was carried away by currents; the harder, more cemented layers remain. A similar process of selective erosion produced the sea cave at Telok Pandan Besar and the carved cliff faces visible from the park jetty.
Batu Kapal is best seen from the water on the boat journey between Kampung Bako jetty and the park — ask your boatman to make a slow pass along the southern coast if conditions permit (this adds 10–15 minutes to the journey and is weather-dependent). From the park's southern trails, particularly the Bukit Gondol summit, the stacks are visible on the horizon. At dawn, when the sea is calm and the low sun catches the iron-stained cliffs, the scene is extraordinary.
The rock faces of Batu Kapal support their own micro-ecosystem. Seabirds — primarily swiftlets and frigatebirds — nest in crevices on the vertical faces. Water monitors have been observed swimming between the park's mainland cliffs and the stacks at low tide. No landing is permitted on the formations — the park boundary extends to protect the nesting sites — but close viewing from a boat at a respectful distance is permitted and strongly recommended as part of the boat transfer experience.