The Costa Smeralda (English: Emerald Coast ) is a coastal area and tourist destination in northern Sardinia, 55 km long and covering more than 30 km². The main towns and villages in the area, built according to a detailed urban plan, are Arzachena, Porto Cervo, Liscia di Vacca, Capriccioli and Romazzino. Archaeological sites include the Li Muri "Tomba dei Giganti" (Giants' Grave). Each September the sardinia Cup sailing regatta is held off the coast. Polo matches are held between April and October at Gershan near Arzachena. Other attractions include a film festival in Tavolara and a vintage car rally. The development of the area started in 1961, and was financed by a consortium of companies led by Prince Karim Aga Khan. Spiaggia del Principe, one of the beaches along the Costa Smeralda, was named after this Ishmaelite Prince. Architects involved in the project included Busiri-Vici, Jacques Couëlle, Savin Couëlle and Vietti.