Mona, Puerto Rico in the context of "Mona Passage"

Monito Island (English: Little Mona, Spanish: Islote Monito) is an uninhabited island about 3.1 miles (5.0 km) northwest of the much larger Mona Island. Monito is the masculine diminutive form of Mona in Spanish, which also translates to little monkey in Spanish. It is one of three islands in the Mona Passage, and part of the Isla de Mona e Islote Monito barrio, a subdivision of the municipality of Mayagüez, Puerto Rico.

It is 46.43 miles (74.72 km) from the Puerto Rican mainland, and 35.73 miles (57.50 km) from the island of Hispaniola (the coast of the Dominican Republic).

Isla de Mona e Islote Monito is an island-barrio of Mayagüez, Puerto Rico. The U.S. census of 2000 reports six housing units, but a population of zero. The barrio is made up of the islands of Mona and Monito. In 2010, there was a population of 5. This is the largest barrio of Mayagüez by area. The total land area of both islands in the barrio is about 56.93 km (Mona Island 56.783 km and nearby Monito Island 0.147 km), and it comprises 28.3 percent of the total land area of the municipality of Mayagüez. Desecheo Island, 49 km to the northeast, is part of Sabanetas barrio. The Mona Island Lighthouse is located in the barrio. Isla de Mona e Islote Monito is surrounded by the Mona Passage.

Mona Island Light, also known as Faro de la Isla de la Mona, is a historic lighthouse located on the island of Mona, Puerto Rico, in the Mona Passage between Puerto Rico and the Dominican Republic. It is the only lighthouse built of iron and steel in Puerto Rico. While some sources reported that the structure was designed by Gustav Eiffel, who also designed the Eiffel Tower in Paris, recent studies have shown that the tower was designed around 1885 by Spanish engineer Rafael Ravena.

It is the first of two lighthouses built by the U.S. government in Puerto Rico.