The road ends at Poseidónio (12km from Vathý), an attractive and protected harbour, backed by olive groves, whose name combined with its critical position on the straits clearly suggests the presence of a temple to Poseidon. Strabo mentions such a temple (Geog. XIV.1.14), saying it is on a promontory opposite the islet of Narthekis in the channel. This could put the site at any point from the hill at Psilí Ammos to the promontory south west of the harbour here. Strabo says that the strait dividing the island from Asia Minor is seven stadia wide (c. 1,300m). It is in fact more like 1,800m across at this point.