The small peninsula of Fykiotrypa forms the eastern end of the small hill on which the Castle of Mytilene is built.

In ancient times, the area was a small island cut off from Lesvos, with which it was separated by a small sea channel. The area is covered by lake sediments aged 1.8-5 million years (Pliocene – Pleistocene). Specifically, it consists of fresh water marly limestones, which contain fossils of invertebrate organisms such as gastropods, laminar gills and ostracods. The northern coast of the area is delimited by an important geological fault running E-W, which ends in the small peninsula of Fykiotrypa.

The action of the fault becomes visible on its smoothed surface, which intersects the geological layers of the rocks of the peninsula at the location of Fykiotrypa. In particular, on the smoothed surface of the fault, slip lines can be seen that testify to the movement that took place on it.

At the top of the small peninsula is the lighthouse of Fykiotrypa. It is a monument as it is one of the few surviving lighthouses that were built during the eighth decade of the 19th century, and is included in the Greek Lighthouse Network and has been declared a preserved monument by the Ministry of Culture.

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