Argostoli (, Katharevousa: Ἀργοστόλιον) is a town and a municipality on the island of Kefalonia, Ionian Islands, Greece. Since the 2019 local government reform it is one of the three municipalities on the island. It has been the capital and administrative centre of Kefalonia since 1757, following a population shift down from the old capital of Agios Georgios (also known as Kastro) to take advantage of the trading opportunities provided by the sheltered bay upon which Argostoli sits. Argostoli developed into one of the busiest ports in Greece, leading to prosperity and growth. The municipality has an area of 377.0 km2 and the municipal unit (the pre-2010 municipality) has an area of 157.670 km2. The 2011 census recorded a population of 10,633 in the Argostoli municipal unit, and 23,499 in the municipality in its post-2019 extension. Its largest towns are Argostóli (pop. 9,748), Razata (507), Dilináta (496) and Kompothekráta (449). Urban landscape To the east of Argostoli, at the end of the bay, beneath the aforementioned Castle of St. George, sits the Koutavos Lagoon, a feeding ground for the Loggerhead turtles (Caretta caretta). Now a nature reserve, the Koutavos Lagoon was once an almost impassable swamp where mosquitoes and malaria were rife. During the period of British occupation of the Ionian Islands, Kefalonia's governor, General Sir Charles James Napier, constructed a wooden bridge across the lagoon. This was done in 1813 by Colonel Charles Philip de Bosset, a Swiss engineer in the employ of the British army. Four years later stone arches were added and, after some 26 years, the entire bridge was rebuilt in stone. In continuous use until 2005, this narrow bridge is now closed to traffic, currently undergoing renovation by the Greek Ministry of Culture. Almost halfway along the De-Bosset Bridge stands a stone column built by the British to celebrate their presence. The coastal road out of Argostoli to the west was known during the Venetian period as the ‘Piccolo Gyro’. Along the Piccolo Gyro, in the Vlikha area facing Lixouri, lie the ‘Swallow Holes’ of Katovothres, a geological phenomenon. Sea water disappears underground and travels under the island, re-emerging around fourteen days later in the Karavomylos area of Sami, having passed through the nearby, underground Melissani lake. The power of this sea water was harnessed, in 1835, to power a water mill. Further along the Piccolo Gyro is the Agion Theodoron lighthouse, named after the