It is situated on the Hicacos Peninsula, between the Bay of Cárdenas and the Straits of Florida, some 140 km east of Havana, at the eastern end of the Via Blanca highway. The peninsula is only 1.2 km wide at its widest point and is separated from the island of Cuba by the Kawama Channel. This spit of land however extends more than 20 kilometers from the mainland in a northeasterly direction and its tip, Punta Hicacos, is the northernmost point of the island of Cuba. At the northeastern end of the peninsula there is a nature reserve with virgin forests and beaches. The Hicacos Point Natural Park is a 3.12 km2 (1.2 sq mi) ecological preserve established in 1974. It contains the 250 m (820 ft) long Cave of Ambrosio, Mangón Lake (home to 31 species of birds and 24 species of reptiles) and the ruins of the La Calavera (The Skull) Salt Works (one of the first salt works to be constructed by the Spanish in the New World). The cays developed off shore, such as Cayo Piedras and Cayo Cruz del Padre are the western most part of the Sabana-Camaguey Archipelago. Juan Gualberto Gómez Airport, situated west of the peninsula, is Varadero's airport. It is the second-most-important airport of the island after José Martí Airport in Havana, and serves international and domestic flights.