Puerto Rico , officially the Commonwealth of Puerto Rico (Spanish: "Estado Libre Asociado de Puerto Rico" — literally Associated Free State of Puerto Rico), is a self-governing unincorporated territory of the United States located in the northeastern Caribbean Sea, east of the Dominican Republic and west of the Virgin Islands. Puerto Rico (Spanish for "rich port") is composed of an archipelago that includes the main island of Puerto Rico and a number of smaller islands, the largest of which are Vieques, Culebra, and Mona. The main island of Puerto Rico is the smallest by land area and second smallest by population among the four Greater Antilles, which also include Cuba, Hispaniola, and Jamaica. 
Puerto Ricans often call the island Borinquen, from Borikén, its indigenous Taíno name.[4][5] The terms boricua and borincano derive from Borikén and Borinquen respectively, and are commonly used to identify someone of Puerto Rican heritage. The island is also popularly known as "La Isla del Encanto", which translated means "The Island of Enchantment." Puerto Rico consists of the main island of Puerto Rico and various smaller islands, including Vieques, Culebra, Mona, Desecheo, and Caja de Muertos. Of these last five, only Culebra and Vieques are inhabited year-round. Mona is uninhabited most of the year except for employees of the Puerto Rico Department of Natural Resources. There are also many other even smaller islands including Monito and "La Isleta de San Juan" which includes Old San Juan and Puerta de Tierra. The Commonwealth of Puerto Rico has an area of 13,790 square kilometers (5,320 sq mi), of which 8,870 km2 (3,420 sq mi) is land and 4,921 km2 (1,900 sq mi) is water.[99] The maximum length of the main island from east to west is 180 km (110 mi), and the maximum width from north to south is 65 km (40 mi).[100] Puerto Rico is the smallest of the Greater Antilles. It is 80% of the size of Jamaica,[101] just over 18% of the size of Hispaniola and 8% of the size of Cuba, the largest of the Greater Antilles.[102] Puerto Rico is mostly mountainous with large coastal areas in the north and south. The main mountain range is called "La Cordillera Central" (The Central Range). The highest elevation in Puerto Rico, Cerro de Punta 1,339 meters (4,393 ft),[99] is located in this range. Another important peak is El Yunque, one of the highest in the Sierra de Luquillo at the El Yunque National Forest, with an elevation of 1,065 m (3,494 ft).[103] Puerto Rico has 17 lakes, all man-made, and more than 50 rivers, most originating in the Cordillera Central.[104] Rivers in the northern region of the island are typically longer and of higher water flow rates than those of the south, since the south receives less rain than the central and northern regions. Puerto Rico is composed of Cretaceous to Eocene volcanic and plutonic rocks, overlain by younger Oligocene and more recent carbonates and other sedimentary rocks.[105] Most of the caverns and karst topography on the island occurs in the northern region in the carbonates. The oldest rocks are approximately 190 million years old (Jurassic) and are located at Sierra Bermeja in the southwest part of the island. They may represent part of the oceanic crust and are believed to come from the Pacific Ocean realm. Puerto Rico lies at the boundary between the Caribbean and North American plates and is being deformed by the tectonic stresses caused by their interaction. These stresses may cause earthquakes and tsunamis. These seismic events, along with landslides, represent some of the most dangerous geologic hazards in the island and in the northeastern Caribbean. The most recent major earthquake occurred on October 11, 1918 and had an estimated magnitude of 7.5 on the Richter scale.[106] It originated off the coast of Aguadilla and was accompanied by a tsunami. The Puerto Rico Trench, the largest and deepest trench in the Atlantic, is located about 115 km (71 mi) north of Puerto Rico at the boundary between the Caribbean and North American plates.[107] It is 280 km (170 mi) long.[108] At its deepest point, named the Milwaukee Deep, it is almost 8,400 m (27,600 ft) deep, or about 5.2 miles.[107] Located in the tropics, Puerto Rico has an average temperature of 82.4 °F (28 °C) throughout the year. Temperatures do not change drastically throughout the seasons. The temperature in the south is usually a few degrees higher than the north and temperatures in the central interior mountains are always cooler than the rest of the island. The Hurricane season spans from June to November. The all-time low in Puerto Rico has been 39 °F (4 °C), registered in Aibonito.[109] Species endemic to the archipelago are 239 plants, 16 birds and 39 amphibians/reptiles, recognized as of 1998. Most of these (234, 12 and 33 respectively) are found on the main island.[110] The most recognizable endemic species and a symbol of Puerto Rican pride is the Coquí, a small frog easily identified by the sound of its call, and from which it gets its name. Most Coquí species (13 of 17) live in the El Yunque National Forest, a tropical rainforest in the northeast of the island previously known as the Caribbean National Forest. El Yunque is home to more than 240 plants, 26 of which are endemic to the island. It is also home to 50 bird species, including the critically endangered Puerto Rican Amazon. Across the island in the southwest, the 40 km2 (15 sq mi) of dry land at the Guánica Commonwealth Forest Reserve[111] contain over 600 uncommon species of plants and animals, including 48 endangered species and 16 endemic to Puerto Rico. Language The official languages are Spanish and English with Spanish being the primary language. English is taught as a second language in public and private schools from elementary levels to high school and in universities. [130] Particularly, the Spanish of Puerto Rico, has evolved into having many idiosyncrasies that differentiate it from the language as spoken in other Spanish-speaking countries. This is mainly due to the influences from ancestral languages, such as those from the Taínos and Africans, and more recently from the English language influence resulting from its relationship with the United States. According to a study by the University of Puerto Rico, nine of every 10 Puerto Ricans residing in Puerto Rico do not speak English at the advanced level [131] and according to a brief report of the U.S. Census 2000, seven of every 10 Puerto Ricans residing in Puerto Rico does not speak English at the advanced level. [ Education Education in Puerto Rico is divided in three levels — Primary (elementary school grades 1-6), Secondary (intermediate and high school grades 7-12), and Higher Level (undergraduate and graduate studies). As of 2002, the literacy rate of the Puerto Rican population was 94.1%; by gender, it was 93.9% for males and 94.4% for females.[147] According to the 2000 Census, 60.0% of the population attained a high school degree or higher level of education, and 18.3% has a bachelor's degree or higher. Instruction at the primary school level is compulsory between the ages of 5 and 18 and is enforced by the state. The Constitution of Puerto Rico grants the right to an education to every citizen on the island. To this end, public schools in Puerto Rico provide free and non-sectarian education at the elementary and secondary levels. At any of the three levels, students may attend either public or private schools. As of 1999, there were 1532 public schools[148] and 569 private schools in the island.[citation needed] The largest and oldest university system in Puerto Rico is the public University of Puerto Rico (UPR) with 11 campuses. The largest private university systems on the island are the Sistema Universitario Ana G. Mendez which operates the Universidad del Turabo, Metropolitan University and Universidad del Este, the multi-campus Inter American University, the Pontifical Catholic University, and the Universidad del Sagrado Corazón. Puerto Rico has four schools of Medicine and four Law Schools. Transportation  Tren Urbano at Bayamón Station
Cities and towns in Puerto Rico are interconnected by a system of roads, freeways, expressways, and highways maintained by the Highways and Transportation Authority under the jurisdiction of the U.S. Department of Transportation, and patrolled by the Police of Puerto Rico. The island's metropolitan area is served by a public bus transit system and a metro system called Tren Urbano (in English: Urban Train). Other forms of public transportation include seaborne ferries (that serve Puerto Rico's archipelago) as well as Carros Públicos ( private mini buses). The island has three international airports, the Luis Muñoz Marín International Airport in Carolina, Mercedita Airport in Ponce, and the Rafael Hernández Airport in Aguadilla, and 27 local airports. The Luis Muñoz Marín International Airport is the largest aerial transportation hub in the Caribbean, and one of the largest in the world in terms of passenger and cargo movement.[149] Puerto Rico has 9 ports in different cities across the main island. The San Juan Port is the largest in Puerto Rico, and the busiest port in the Caribbean and the 10th busiest in the United States in terms of commercial activity and cargo movement, respectively.[150] The second largest port is the Port of the Americas in Ponce currently under expansion to increase cargo capacity to 1.5 million 20 ft. containers (TEUs) per year.[151] |