Cephalonia or Kefalonia (Greek: Κεφαλονιά or Κεφαλλονιά), formerly also known as Kefallinia or Kephallenia (Κεφαλληνία), is the largest of the Ionian Islands in western Greece. It is also a separate regional unit of the Ionian Islands region, and the only municipality of the regional unit. The capital of Cephalonia is Argostoli.
The island is about 781 sq km (300 sq mi), with a population density of 55 people per sq km (140/ sq mi). The town of Argostoli has one-third of the island's inhabitants. Lixouri is the second major settlement, and the two towns together account for almost two-thirds of the prefecture's population.
Tourism to Cephalonia started in the early 19th century, also the Royal Family of Greece sent their children in the summer months to Lixouri, but the island was not discovered by most tourists until the 1980s.
Tourists from all over Greece, Europe and the World visit Cephalonia. It is a popular vacation destination for many Italians, due to its close proximity to Italy. As one of the largest islands in Greece, it is well-equipped to handle the influx of tourists during the summertime and it has something to offer everyone.
Two natural attractions, Melissani's underground lake and Myrtos Beach, have helped popularize Cephalonia. The film, Captain Corelli's Mandolin (2001), shot on the island itself, made Cephalonia more widely known.