Porto Cervo is an Italian seaside resort in northern Sardinia. It is a frazione of the comune of Arzachena, in the province of Sassari. Created by Prince Karim Aga Khan and various other investors, Porto Cervo is the main centre of Costa Smeralda. It has a resident population of 421 inhabitants. Porto Cervo has been named one of the most expensive resorts in the world, along as being a luxury yacht magnet and billionaires' playground.