Kythira Strait

It measures approximately 100 kilometres (62 mi) in length and is situated between the Peloponnese and the island of Crete.

[5][6] The strait between Kythera and Cape Maleas was found dangerous in ancient days by the Greek mariners.

[5] Most sea-traffic from Athens, Istanbul, and the Black Sea to the central and western Mediterranean passes through the strait and are often subject to strong winds and shipwreck on Cape Maleas.

Also reported in the strait are earthquakes at shallow and intermediate depths, with surface-wave magnitudes of up to 8.0.

[8] The Kythira Strait's Tsunami Warning System (TWS) comprises two interrelated elements.