On the top of the hill is an office of the Marine Department and a lighthouse southwest guides the ships in Sulphur Channel.

These are of the same construction as those found on the Cape Collinson Lighthouse at Siu Sai Wan, Hong Kong Island.

[7] Construction began on a second lighthouse in 1904, completed in 1905, which was originally intended to house the Cape D’Aguilar light.

Built of granite and concrete, sitting beside its predecessor, the newer lighthouse is 17.5 metres (57 ft) tall, painted white, with a steel-caged lantern on top.

Green Island is an important reporting point for location aviation in Hong Kong for entry to Victoria Harbour by air.

In the 1990s, the Hong Kong Government proposed reclaiming approximately 181 hectares (450 acres) of land from Sulphur Channel to provide accommodation for a population of 103,465 and more road infrastructure.

This included a coastal highway from Kennedy Town to Aberdeen (then called Route 7) and a fourth cross-harbour tunnel to a proposed container port at North Lantau.