Katerini (, Kateríni, ) is a city and municipality in northern Greece, the capital city of Pieria regional unit in Central Macedonia, Greece. It lies on the Pierian plain, between Mt. Olympus and the Thermaikos Gulf, at an altitude of 14 m. The municipal unit of Katerini has a population of 85,851 (according to the 2014 census) and it is the second most populous urban area at the Region of Macedonia after Thessaloniki. The close distance between two cities (68 km), has been beneficial for Katerini's development over recent years. Katerini is accessible from the main Thessaloniki–Athens highway GR-1/E75 (with the Katerini's South, East and North interchanges) and the Egnatia Odos to the north. It is served by Intercity, Proastiakos (Suburban Railway) and local trains on the main railway line from Athens to Thessaloniki and there is a comprehensive regional and national bus service with its hub in the city. A popular tourist destination in northern Greece, Katerini is close to the sea (7 km) and to several archaeological sites of great interest such as the ancient city of Dion (5th century BC, 17 km away), the ancient Leivithra (27 km away),ancient Pydna (16km away) and the Castle of Platamon. The beaches of Korinos, Paralia and Olympiaki Akti (or Katerinoskala) are visited by both Greek and foreign tourists during the Summer. The base of Mount Olympus and the town of Litochoro, are at a distance of around 20 km from the centre of Katerini, whereas there is the Ski center of Elatochori in Mount Pieria at a distance of 33.4 km from the city's centre. Name and history The origin of the name is obscure. Since the 13th century, travellers as well as maps record the existence of a settlement called Hatera (Ἅτηρα), which may have been the origin of the modern name. Thus Felix Beaujour recorded its name as "Katheri", while François Pouqueville gives the name of the settlement as "Kateri Hatera". According to another theory, the city derives its name from the small chapel dedicated to Saint Catherine (Aikaterini in Greek) to the east of the city, dating to at least the early 19th century. The latter hypothesis influenced official usage in Greek, where the city is found as "Aikaterini" or "Agia Aikaterini" until the early 20th century, when the vernacular name Katerini prevailed. According to the reports of travellers, at the turn of the 19th century, the