Vieques, Puerto Rico in the context of "Naval gunfire support"

The barrios of Puerto Rico are the third-level administrative divisions defined with geographic boundaries serving as the primary legal subdivisions of the 78 municipalities in the archipelago and island of Puerto Rico, an unincorporated territory of the U.S. Amounting to 902 wards or boroughs equivalent to minor civil divisions in the U.S., like cities, townships, and parishes, barrios are under the governmental authority of the popularly elected strong mayor and unicameral legislature governing the municipality within which they are located. Barrios are subdivided into numerous subbarrios, districts, communities, and/or sectors.

Except for San Juan, Ponce, Florida, and Vieques, all municipalities have a barrio equivalent to a downtown area in the U.S. called pueblo, officially known as barrio-pueblo (literally "neighborhood-town"), which typically is the site of the historic Spanish colonial settlement, administrative center, and urban core of the municipality. Of the 902 barrios proper, 828 are barrios and 74 barrios-pueblos.

Puerto Rico (abbreviated PR), officially the Commonwealth of Puerto Rico, is a self-governing Caribbean archipelago and island organized as an unincorporated territory of the United States under the designation of commonwealth. Located about 1,000 miles (1,600 km) southeast of Miami, Florida, between the Dominican Republic in the Greater Antilles and the U.S. Virgin Islands in the Lesser Antilles, it consists of the eponymous main island and numerous smaller islands, including Vieques, Culebra, and Mona. With approximately 3.2 million residents, it is divided into 78 municipalities, of which the most populous is the capital municipality of San Juan, followed by those within the San Juan metropolitan area. Spanish and English are the official languages of the government, though Spanish predominates.

Puerto Rico was settled by a succession of Amerindian peoples beginning 2,000 to 4,000 years ago; these included the Ortoiroid, Saladoid, and Taíno. It was claimed by Spain following the arrival of Christopher Columbus in 1493 and subsequently colonized by Juan Ponce de León in 1508. Puerto Rico was contested by other European powers into the 18th century but remained a Spanish possession for the next 400 years. The decline of the Indigenous population, followed by an influx of Spanish settlers, primarily from the Canary Islands and Andalusia, and African slaves vastly changed the cultural and demographic landscape of the archipelago. Within the Spanish Empire, Puerto Rico played a secondary but strategically significant role compared to larger and wealthier colonies like Peru and New Spain. By the late 19th century, a distinct Puerto Rican identity began to emerge, centered on a fusion of European, African, and Indigenous elements. In 1898, following the Spanish–American War, Puerto Rico was acquired by the United States.

The municipalities of Puerto Rico (Spanish: municipios de Puerto Rico) are second-level administrative divisions defined with geographic boundaries and governmental authority in the archipelago and island of Puerto Rico, an unincorporated territory of the U.S. Amounting to 78 incorporated towns and cities equivalent to U.S. counties, two of which are outside the main island, namely the smaller islands of Vieques and Culebra, the municipalities are governed by a popularly elected strong mayor and unicameral legislature. They are subdivided into 902 barrios, third-level divisions controlled by the municipal government. As a jurisdiction under U.S. sovereignty, Puerto Rico does not have first-level administrative units akin to states or provinces.

The municipalities of Puerto Rico operate under the Municipal Code of Puerto Rico (Law. No. 107 of 2020), which superseded the Autonomous Municipalities Act of Puerto Rico (Law No. 81 of 1991), as established by the Legislative Assembly of Puerto Rico, the governmental body responsible for their organization under Section 1, Article VI of the Constitution of Puerto Rico. Electorally, the municipalities are grouped into eight senatorial districts and forty representative districts, representing roughly equal populations in the Legislative Assembly.

The geography of Puerto Rico encompasses the geographical features of Puerto Rico, a Caribbean archipelagic and island nation centered around a collective identity based on its land, history, ethnicity, culture, and language, and organized as a self-governing unincorporated territory of the United States. Located between the Greater and Lesser Antilles in the northeastern Caribbean Sea, east of Hispaniola, west of Saint Thomas, north of Venezuela, and south of the Puerto Rico Trench, it consists of the eponymous main island of Puerto Rico and 142 smaller islands, islets, and cays, including San Juan Islet in the north, Vieques and Culebra islands in the Virgin Islands, and Palominos island and Icacos cay in La Cordillera nature reserve in the east, Caja de Muertos island in Caja de Muertos reserve, and Caracoles and Media Luna cays in La Parguera reserve in the south, and Mona, Monito, and Desecheo islands in the Mona Passage in the west.

Measuring 177 km (110 mi; 96 nmi) in length and 65 km (40 mi; 35 nmi) in width with a land area of 8,868 sq km (3,424 sq mi), the main island of Puerto Rico is the 4th largest in the Caribbean, 29th in the Americas, and 81st in the world, making it the 170th largest country or dependency by surface area. With 3.2 million residents, it is also the 4th largest in the Caribbean, 4th in the Americas, and 31st in the world, making it the 136th largest country or dependency by population.

Culebra, officially Isla de Culebra (Spanish pronunciation: [kuˈleβɾa], "Snake Island"), is an island and municipality of Puerto Rico, comprising the Spanish Virgin Islands together with Vieques. Located about 17 miles (27 km) east of the main island of Puerto Rico, it is 9 miles (14 km) northeast of Vieques and 12 miles (19 km) west of Saint Thomas in the U.S. Virgin Islands. Culebra is spread over 5 barrios and Culebra Pueblo, its historic and administrative center. Residents of the island are known as culebrenses. With a population of 1,792 as of the 2020 Census, it is the least populous municipality in Puerto Rico.

Originally called Isla del Pasaje and Isla de San Ildefonso, Culebra is also known as Isla Chiquita ("Little Island"), Cuna del Sol Borincano ("Cradle of the Puerto Rican Sun") and Última Virgen ("Last Virgin", due to its position at the end of the Virgin Islands archipelago).

German attempts at the colonization of the Americas consisted of German Venezuela (German: Klein-Venedig, also German: Welser-Kolonie), St. Thomas and Crab Island in the 16th and 17th centuries.

The Darien scheme was an unsuccessful attempt, backed largely by investors of the Kingdom of Scotland, to gain wealth and influence by establishing New Caledonia or Britain-in-Panama, a colony in the Darién Gap on the territory of present-day Panama, in the late 1690s. The plan was for the colony, located on the Gulf of Darién, to establish and manage an overland route to connect the Pacific and Atlantic Oceans. The backers knew that the first sighting of the Pacific Ocean by Vasco Núñez de Balboa was after crossing the isthmus through Darién. The expedition also claimed sovereignty over "Crab Isle" (modern day Vieques, Puerto Rico) in 1698, yet sovereignty was short-lived. The settlement attempt failed; more than 80 percent of participants died within a year, and the settlement was abandoned twice.

There are many potential explanations for the disaster, including poor planning and provisioning; divided leadership; a lack of trade with local indigenous tribes or neighbouring Dutch and English colonies; epidemics of tropical disease; widespread opposition to the scheme from commercial interests in England; and a failure to anticipate a military response from the Spanish Empire. The settlement was abandoned in March 1700 after a siege by Spanish forces that also blockaded the harbour.

This is a list of islands of Puerto Rico.

The Commonwealth of Puerto Rico has over 143 islands, keys, and islets. Only the main island of Puerto Rico (3,424 sq mi [8,868 km2]), and the islands of Vieques (51 sq mi [130 km]), and Culebra (10 sq mi [26 km]) are inhabited. Mona Island (22 sq mi [57 km]) has personnel from the Puerto Rico Department of Natural and Environmental Resources (DNER) stationed year-around but no private citizens inhabit it (other than overnight camping guests and nature enthusiasts). Caja de Muertos Island (0.58 sq mi [1.5 km]) is also a DNER Nature Reserve, while Desecheo Island (0.58 sq mi [1.5 km]) is a National Wildlife Refuge administrated by the US Fish and Wildlife Service.