This uninhabited island not only plays a critical ecological role as part of the Brunei River's mangrove ecosystem but also serves as an important navigational landmark, aiding vessels traversing the river.

Sharing similar features with nearby islands like Pulau Lumut Lunting, which spans just 1 hectare, Sibungor Island is surrounded by marshes fringed with Rhizophora apiculata mangroves.

These islands play a crucial role in the Brunei River's rich mangrove ecosystem, providing essential breeding and nursery grounds for various aquatic organisms.

Eager and the Sarawak government launch Apoh collided in the entrance to Brunei Town, close to Sibungor Island.

The Apoh was hit amidships on the port side and suffered serious damage above the waterline.