As an ancient city, lying off the east coast, Mytilene was initially confined to a small island just offshore that later was joined to Lesbos, creating a north and south harbor. The early harbors of Mytilene were linked during ancient times by a channel 700 meters long and 30 meters wide. The Roman writer Longus speaks of white stone bridges linking the two sides. The Greek word εὔριπος "eúripos" is a commonly-used term when referring to a strait. The strait allowed ancient warships called triremes, with three tiers of rowers or more. The boats that passed were ca. six meters wide plus oars and had depth of two meters.