The province of Trapani borders the
Tyrrhenian Sea to the north, the Mediterranean Sea to the south, and the
Strait of Sicily to the west. It is bordered to the east with only the provinces of
Palermo and
Agrigento. The territory has few flat areas, although with the exception of the mountains of Sparagio (1,110 m) and Inici (1,065 m), most land is under 1,000 metres. The northwestern part is rugged in comparison to the south. The province also includes the archipelago of the
Aegadian Islands belonging to the
comune (municipality) of
Favignana, the island of
Pantelleria which is the largest of Sicily, in the
comune of the same name, and the
Stagnone Islands, which belong to the
comune of
Marsala. The Egadi Islands consist of three main islands, Favignana, Levanzo and Marettimo and two islets, Formica and Maraone. The province of Trapani has a number of rivers, but most are not of notable size or importance, except for the
Belice on the border of the province, and the
Birgi, with a length of about 40 km. Other rivers include the torrential Modione, Mazaro, the Fiume, the Salemi and the Sossius, the latter of which flows into the Mediterranean Sea at the resort of
Berbaro. Natural lakes include the Gorghi Tondi and Preola, in the
comune of
Mazara del Vallo, and the
Lago di Venere in Pantelleria. There are also three man-made lakes, Lago Rubino, created by a dam across the
Cuddia River, which is part of the catchment area of the Birgi, at Lago Trinità in
Castelvetrano, and the lake of the same name at the resort of
Paceco. However, there is also a coastal lagoon, the
Stagnone Lagoon, within a 2000-hectare reserve on the stretch of coast between Punta Alga and Cape San Teodoro, near Marsala, in an area which was once an important naval base and commercial for the Phoenicians. The waters are shallow and very salty, with marshland. The lagoon consists of four islands: Isola Longa Santa Maria, San Pantaleo and Schola. and the
Aegadian Islands are also administratively a part of Trapani province. == Municipalities ==