The Netherlands Antilles was an autonomous Caribbean country within the Kingdom of the Netherlands. It was dissolved on 10 October 2010. After dissolution, the "BES islands" of the Dutch Caribbean—Bonaire, Sint Eustatius, and Saba—became the Caribbean Netherlands, "special municipalities" of the Netherlands proper—a structure that only exists in the Caribbean. Meanwhile Curaçao and Sint Maarten became constituent countries within the Kingdom of the Netherlands, along the lines of Aruba, which separated from the Netherlands Antilles on 1 January 1986.