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Range DescriptionHalophila ovalis is widespread in the Indo-Pacific. In the Pacific, it occurs from southern Japan throughout Southeast Asia, many islands of the western Pacific, and through all but the southern coast of Australia as well as Lord Howe and Norfolk Islands and as far east as Tonga and Samoa. In the Indian Ocean, H. ovalis is found from southwestern Australia to East Africa and the Red Sea, including Madagascar, with some exceptions of islands or coastlines with no records. Recently H. ovalis has been discovered in the Atlantic Ocean on the Island of Antigua (Short et al. 2010).