Many places in Hong Kong got their names from rivers. With urban development, many of these rivers are converted into sewers, as it is difficult to stop them flowing downhill. List of subterranean rivers Kwai Chung Kai Tak Nullah (partly) Sai Wan Ho Tai Hang Tsak Yue Chung (lower course) Tsui Ping Nullah (middle course) Wong Nai Chung See also Subterranean river Subterranean rivers of London Subterranean Hong Kong Rivers of Hong Kong Subterranean rivers