Colima (koˈlima), officially the Free and Sovereign State of Colima (Estado Libre y Soberano de Colima), is among the 31 states that make up the 32 Federal Entities of Mexico. It shares its name with its capital and main city, Colima. Colima is a small state of western Mexico on the central Pacific coast, and includes the four oceanic Revillagigedo Islands. Mainland Colima shares borders with the states of Jalisco and Michoacán. In addition to the capital city of Colima, the main cities are Manzanillo and Tecomán. Colima is the fourth smallest state in Mexico and has the second smallest population, but has one of Mexico's highest standards of living and the lowest unemployment. It is also the state with the highest murder rate per capita and one of the highest crime rates, due to its ports being a contested area for cartels. The state covers a territory of 5,455 km2 and is the fourth smallest federal entity after Tlaxcala, Morelos and the Federal District of Mexico City, containing only 0.3% of the country's total territory. The state is in the middle of Mexico's Pacific coast, bordered by the Pacific Ocean and the states of Jalisco and Michoacán. Colima's territory includes the Revillagigedo Islands—Socorro, San Benedicto, Clarión, and Roca Partida. These are under federal jurisdiction but are considered part of the municipality of Manzanillo. Politically, the state is divided into ten municipalities. Natural geography divides the state into a northern and southern region. The north has a cooler climate due to the higher mountains. The south is hotter and includes the Pacific Ocean coastline. The Revillagigedo Islands, of volcanic origin, are dispersed along the 19° north parallel over an area of about 400 km2—with a total landmass of 205 km2. The altitude varies from sea level to 3,839 m (12,595 ft) at the crater of the Volcán de Colima. The state is in an offshoot of the Sierra Madre Occidental mountain range and geographically consists of four mountain systems.