The Peloponnese Region is a region in southern Greece. It borders Western Greece to the north and Attica to the north-east. The region has an area of about 15,490 square kilometres. It covers most of the Peloponnese peninsula, except for the northwestern subregions of Achaea and Elis which belong to Western Greece and a small portion of the …The Peloponnese Region is a region in southern Greece. It borders Western Greece to the north and Attica to the north-east. The region has an area of about 15,490 square kilometres. It covers most of the Peloponnese peninsula, except for the northwestern subregions of Achaea and Elis which belong to Western Greece and a small portion of the Argolid peninsula that is part of Attica.