Kuala Belait is a small, quiet town at the mouth of the Belait River in the southwest of Brunei — the last stop before the border crossing into Sarawak, Malaysia. The town exists largely because of the oil industry; Shell has had a presence in the region since the 1930s and the surrounding district is the centre of Brunei's petroleum wealth.
There is not much to detain travellers for long, but if you are passing through on the way to Miri you will find a handful of decent Chinese restaurants worth stopping at. Meng Fang's, The Orchid Rooms, and the Jade Restaurant all serve solid local food. The Belait District Museum is a good quick introduction to the region's history, and Belait Beach is a pleasant spot for an evening walk.