Emydocephalus orarius, also known as the white-crowned or white-naped sea snake, is a species of sea snake endemic to Australian waters. The specific epithet orarius (âÂÂcoastalâÂÂ) refers to its known habitat.
The species grows up to 116 cm in length.
The species has been recorded from soft-bottomed waters off the Kimberley, Pilbara and Gascoyne coasts of Western Australia, including Barrow and Legendre Islands. The type locality is Shark Bay.