Porto Koufo is the largest and safest natural harbor in Greece.
Its name <kofos limin> was mentioned by Thucydides. Its
dimensions are : maximum length 1.600m., maximum width 550m.,
maximum depth 8.23m, entrance opening 300m., entrance depth 10.33m.
and 5,5-27 m. On its rocky and steep coastline open up caves,
in one particularly on the south-eastern side of the entrance
the visitor can enter by boat. Another interesting cave is found
on the south-east side of the harbor, on the peak section of the
old quarry. A visit today is almost impossible due to the section
created by quarrying. This cave must have been a worship spot
during the roman years. Later, to purify the area, the Christians
drew red characteristic crosses on the caves roof.