Tathong Channel (Chinese: 大東門), also known as Nam Tong Hoi Hap (藍塘海峽, originally 南堂海峽), refers to the eastern sea water area in Hong Kong leading into Victoria Harbour through Lei Yue Mun, bounded by Junk Island (Fat Tong Chau) and Tung Lung Chau in the east, and Hong Kong Island in the west.^[1]

22°15′42″N 114°15′59″E / 22.26167°N 114.26639°E / 22.26167; 114.26639