<P> The country consists of a mountainous , peninsular mainland jutting out into the Mediterranean Sea at the southernmost tip of the Balkans , and two smaller peninsulas projecting from it : the Chalkidice and the Peloponnese , which is joined to the mainland by the Isthmus of Corinth . Greece also has many islands , of various sizes , the largest being Crete , Euboea , Rhodes and Corfu ; groups of smaller islands include the Dodecanese and the Cyclades . According to the CIA World Factbook , Greece has 13,676 kilometres ( 8,498 mi ) of coastline , the largest in the Mediterranean Basin . </P>
mainland greece is a body of land with water on three sides called
peninsular