Subterranean rivers in Hong KongMany 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 riversKwai ChungKai Tak Nullah Sai Wan HoTai HangTsak Yue Chung Tsui Ping Nullah Wong Nai Chung