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The 4th Regional Command under the Vietnam People's Navy (VPN) is the naval operations command that independently manages and protects the Spratly Islands, Phú Quý Island, South China Sea and the South Central Coast, from Phú Yên to the North Bình Thuận including the provinces: Phú Yên, Khánh Hòa, Ninh Thuận and the North of Bình Thuận. Its headquarter is in the Cam Ranh Bay Navy Base.