Information: - A cay (or ), also spelled caye or key, is a small, low-elevation, sandy island on the surface of a coral reef. Cays occur in tropical environments throughout the Pacific, Atlantic and Indian Oceans (including in the Caribbean and on the Great Barrier Reef and Belize Barrier Reef). - Moser Channel is the deepest passage spanned by the Seven Mile Bridge and is one of four predominant passages in the Florida Keys which allow exchange of waters to the north and west of the Keys (including Florida Bay and the Gulf of Mexico) with the Atlantic waters of Hawk Channel and the Florida Reef to the south and east. Moser Channel has an orientation perpendicular to the bridge. The other three Keys passages important to the exchange of south Florida coastal waters are Long Key Channel, Channel 5, and Channel 2. - An archipelago, sometimes called an island group or island chain, is a chain, cluster or collection of islands. The word "archipelago" is derived from the Greek "- arkhi-" ("chief") and " pelagos" ("sea") through the Italian "arcipelago". In Italian, possibly following a tradition of antiquity, the Archipelago (from medieval Greek "*" and Latin "archipelagus") was the proper name for the Aegean Sea and, later, usage shifted to refer to the Aegean Islands (since the sea is remarkable for its large number of islands). It is now used to refer to any island group or, sometimes, to a sea containing a small number of scattered islands. - Pigeon Key is a historic district located on the small island of Pigeon Key in the lower Florida Keys . The island is named '' Cayo Paloma '' on many old Spanish charts . It is located off the old Seven Mile Bridge , at approximately mile marker 45 , west of Knight 's Key , ( city of Marathon in the middle Florida Keys ) and just east of Moser Channel , which is the deepest section of the 7 mile span . Said to be named for large flocks of white - crowned pigeons ( Columba leucocephala Linnaeus ) which once roosted there . During the building of Henry Flagler 's Overseas Railroad Key West Extension , a major construction depot was located there , the jumping off point for construction of the Seven Mile Bridge . A number of buildings from the Flagler era remain on the island . They are now part of the Pigeon Key Historic District . - Pigeon Key is a small island containing the historic district of Pigeon Key, Florida. The island is home to 8 buildings on the National Register of Historic Places, some of which remain from its earliest incarnation as a work camp for the Florida East Coast Railway. Today these buildings serve a variety of purposes, ranging from housing for educational groups to administrative offices for the non-profit Pigeon Key Foundation. The former Assistant Bridge Tender's House has been converted into a small museum featuring artifacts and images from Pigeon Key's colorful past. It is located off the old Seven Mile Bridge, at approximately mile marker 45, west of Knight's Key, (city of Marathon in the middle Florida Keys) and just east of Moser Channel, which is the deepest section of the span. - A bridge is a structure built to span physical obstacles without closing the way underneath such as a body of water, valley, or road, for the purpose of providing passage over the obstacle. There are many different designs that each serve a particular purpose and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it. - The Florida East Coast Railway is a Class II railroad operating in the U.S. state of Florida and since 2007 has been a subsidiary of Railroad Acquisition Holdings, LLC, itself a subsidiary of Fortress Investment Group, LLC. - Little Duck Key is a small island in the lower Florida Keys. - Florida Bay is the bay located between the southern end of the Florida mainland (the Florida Everglades) and the Florida Keys in the United States. Encompassing roughly one-third of Everglades National Park, its area is variously stated to be , or , or . Nearly all of Florida Bay is included in Everglades National Park. The southern edge, along the Florida Keys is in the Florida Keys National Marine Sanctuary. The bay muds of portions of Florida Bay have been cored to develop insights on the paleontology of previous biota. It has basins with banks in between which are great fishing grounds. The fish caught there are mangrove snapper, mackerel, and various others. - A historic district or heritage district is a section of a city which contains older buildings considered valuable for historical or architectural reasons. In some countries, historic districts receive legal protection from development. - Miami is a seaport city at the southeastern corner of the U.S. state of Florida and its Atlantic coast. As the seat of Miami-Dade County, the municipality is the principal, central, and most populous of its metropolitan area and part of the second-most populous metropolis in the southeastern United States. According to the U.S. Census Bureau, Miami's metro area is the eighth-most populous and fourth-largest urban area in the U.S., with a population of around 5.5 million. - The Seven Mile Bridge is a famous bridge in the Florida Keys, in Monroe County, Florida, United States. It connects Knight's Key (part of the city of Marathon, Florida) in the Middle Keys to Little Duck Key in the Lower Keys. Among the longest bridges in existence when it was built, it is part of the Overseas Highway in the Keys, which is part of the 2,369-mile U.S. Route 1. - Corals are marine invertebrates in the class Anthozoa of phylum Cnidaria. They typically live in compact colonies of many identical individual polyps. The group includes the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. - Marathon is a city on Knight's Key, Boot Key, Key Vaca, Fat Deer Key, Long Point Key, Crawl Key and Grassy Key islands in the middle of the Florida Keys, in Monroe County, Florida, United States. As of the 2000 census, the city had a total population of 10,255. As of 2014, the population estimated by the U.S. Census Bureau was 8,708. - U.S. Route 1 (US1) is a major northsouth U.S. Highway that serves the East Coast of the United States. It runs , from Fort Kent, Maine, at the CanadaUS border, south to Key West, Florida, making it the longest north-south road in the United States. US1 is generally paralleled by Interstate 95 (I-95), though the former is significantly farther west (inland) between Jacksonville, Florida, and Petersburg, Virginia. The highway connects most of the major cities of the east coast, including Miami, Richmond, Washington, D.C., Baltimore, Philadelphia, New York City, and Boston, passing from the Southeastern United States to New England. - The Florida Keys are a coral cay archipelago located off the southern coast of Florida, forming the southernmost portion of the continental United States. They begin at the southeastern coast of the Florida peninsula, about south of Miami, and extend in a gentle arc south-southwest and then westward to Key West, the westernmost of the inhabited islands, and on to the uninhabited Dry Tortugas. The islands lie along the Florida Straits, dividing the Atlantic Ocean to the east from the Gulf of Mexico to the northwest, and defining one edge of Florida Bay. At the nearest point, the southern part of Key West is just from Cuba. The Florida Keys are between about 23.5 and 25.5 degrees North latitude. - Mexico (, modern Nahuatl ), officially the United Mexican States, is a federal republic in the southern half of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Covering almost two million square kilometers (over 760,000sqmi), Mexico is the sixth largest country in the Americas by total area and the 13th largest independent nation in the world. With an estimated population of over 120 million, it is the eleventh most populous country and the most populous Spanish-speaking country in the world while being the second most populous country in Latin America. Mexico is a federation comprising 31 states and a federal district that is also its capital and most populous city. Other metropolises include Guadalajara, Monterrey, Puebla, Toluca, Tijuana and Leon. - The Dry Tortugas are a small group of islands, located in the Gulf of Mexico at the end of the Florida Keys, United States, about west of Key West, and west of the Marquesas Keys, the closest islands. Still further west is the Tortugas Bank, which is submerged. The first Europeans to discover the islands were the Spanish in 1513, led by explorer Juan Ponce de Leon. They are an unincorporated area of Monroe County, Florida, and belong to the Lower Keys Census County Division. With their surrounding waters, they constitute the Dry Tortugas National Park. - The Florida Reef (also known as the Great Florida Reef, Florida reefs, Florida Reef Tract and Florida Keys Reef Tract) is the only living coral barrier reef in the continental United States. It is the third largest coral barrier reef system in the world (after the Great Barrier Reef and Belize Barrier Reef). It lies a few miles seaward of the Florida Keys, is about 4 miles (6 to 7km) wide and extends (along the 20 meter depth contour) from Fowey Rocks just east of Soldier Key to just south of the Marquesas Keys. The barrier reef tract forms a great arc, concentric with the Florida Keys, with the northern end, in Biscayne National Park, oriented north-south and the western end, south of the Marquesas Keys, oriented east-west. The rest of the reef outside Biscayne National Park lies within John Pennekamp Coral Reef State Park and the Florida Keys National Marine Sanctuary. Isolated coral patch reefs occur northward from Biscayne National Park as far as Stuart, in Martin County. Coral reefs are also found in Dry Tortugas National Park west of the Marquesas Keys. There are more than 6,000 individual reefs in the system. The reefs are 5,000 to 7,000 years old, having developed since sea levels rose following the Wisconsinan glaciation. - The Gulf of Mexico is an ocean basin largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. The U.S. states of Alabama, Florida, Louisiana, Mississippi and Texas border the Gulf on the north, which are often referred to as the "Third Coast" in comparison with the U.S. Atlantic and Pacific coasts, or sometimes the "south coast", in juxtaposition to the Great Lakes region being the "north coast." One of the gulf's seven main areas is the Gulf of Mexico basin. - Key West is an island in the Straits of Florida on the North American continent, at the southernmost tip of the Florida Keys. The island is about from Cuba. - Florida (Spanish for "land of flowers") is a state located in the southeastern region of the United States. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia, to the east by the Atlantic Ocean, and to the south by the Straits of Florida and Cuba. Florida is the 22nd most extensive, the 3rd most populous, and the 8th most densely populated of the U.S. states. Jacksonville is the most populous municipality in the state and is the largest city by area in the contiguous United States. The Miami metropolitan area is Florida's most populous urban area. The city of Tallahassee is the state capital. - Cuba, officially the Republic of Cuba, is a country comprising the island of Cuba as well as Isla de la Juventud and several minor archipelagos. Cuba is located in the northern Caribbean where the Caribbean Sea, the Gulf of Mexico, and the Atlantic Ocean meet. It is south of both the U.S. state of Florida and the Bahamas, west of Haiti, and north of Jamaica. Havana is the largest city and capital; other major cities include Santiago de Cuba and Camaguey. Cuba is the largest island in the Caribbean, with an area of , and the second-most populous after Hispaniola, with over 11 million inhabitants. - The Atlantic Ocean is the second largest of the world's oceans with a total area of about . It covers approximately 20 percent of the Earth's surface and about 29 percent of its water surface area. It separates the "Old World" from the "New World". - The Overseas Highway is a highway carrying U.S. Route 1 (US1) through the Florida Keys. Large parts of it were built on the former right-of-way of the Overseas Railroad, the Key West Extension of the Florida East Coast Railway. Completed in 1912, the Overseas Railroad was heavily damaged and partially destroyed in the Labor Day Hurricane of 1935. The Florida East Coast Railway was financially unable to rebuild the destroyed sections, so the roadbed and remaining bridges were sold to the state of Florida for $640,000. Given the paragraphs above, decide what entity has the relation 'located in the administrative territorial entity' with 'monroe county'.
The answer to this question is:
pigeon key