Selangor is one of the 13 states of Malaysia. It is on the west coast of Peninsular Malaysia and is bordered by Perak to the north, Pahang to the east, Negeri Sembilan to the south and the Strait of Malacca to the west.

Kuala Selangor has an entrance depth of 1.2m. A light is shown from the S side of the entrance. The depths within the entrance are from 2.1 to 5.8m but the anchorage is indifferent, the holding ground being of soft mud and the tidal currents strong.

The Sungai Selangor is usually navigable for small craft up to 1.8m draft for about 5 miles.