Mediterranea and mediteranee in the feminine and mediterraneo and mediterranei in the masculine are Italian equivalents* of the English word "Mediterranean." The respective pronunciations in Italian will be "MEY-dee-ter-RA-ney-a" in the feminine singular and "MEY-dee-ter-RA-ney-ey" in the feminine plural as well as "MEY-dee-ter-RA-ney-o" in the masculine singular and "MEY-dee-ter-RA-ney-ee" in the masculine plural.
*The choice depends upon whether the objects or persons being described are feminine/female or masculine/male.