The Chilean Sea is the portion of the Pacific Ocean lying west of the Chilean mainland. The official Chilean usage for Chilean Sea was defined on 30 May 1974 when the Diario oficial de la Republica de Chile published Supreme Decree #346, which declared that "the waters surrounding or touching the shores of the national territory shall be known as Mar Chileno."
- "Decreto 346: "Denomina Mar Chileno a las aguas del mar que bañan el territorio nacional"". Ministry of Foreign Affairs. 4 June 1974. Retrieved 11 December 2012.