- Arecibo is a city located in the northern coastal plains of Puerto Rico. It is situated in the Arecibo Metropolitan Statistical Area and is the largest city in the region. The city was founded in 1616 and is known for its rich history, cultural heritage, and stunning natural beauty. Arecibo is famous for hosting the Arecibo Observatory, which is home to the world's largest single-dish radio telescope. The city also offers various attractions, such as historical sites, museums, beaches, and a vibrant downtown area. Arecibo's economy is primarily based on agriculture, manufacturing, and tourism. Overall, it is a popular destination for both locals and tourists alike.