the Arabian Sea /əˈreɪbiən/ el Mar de Omán: A ship carrying about a dozen missiles was intercepted today in the Arabian Sea.

the Aral Sea /ˈɑːrəl, ˈærəl/ el Mar de Aral: The Aral Sea is shrinking.

the Baltic (Sea) /ˈbɔːltɪk/ el (Mar) Báltico: There's evidence that Neolithic people gathered amber on the shores of the Baltic sea about 13,000 years ago.

the Black Sea el Mar Negro [an inland sea]: I took the opportunity to get a job on a cruise ship in the Black Sea. ^ The Black Sea contains only a few small islands.

the Caribbean Sea /ˌkærɪˈbiːən, kəˈrɪbiən/ (also the Caribbean) el Mar del Caribe: In those days, the Caribbean Sea was plagued by pirates.