Ithaca lies east of the northwest coast of Cephalonia, from which it is separated by the Strait of Ithaca. The regional unit covers an area of 117.82 square kilometres . The main island stretches in the north-south direction, in length of 23 km and maximum width of 6 km. It consists of two parts, of about equal size, connected by the narrow isthmus of Aetos (Eagle), just 600 metres wide.