Guánica Light was a historic lighthouse located in the town of Guánica, Puerto Rico

Guánica, Puerto Rico

Guánica is a municipality in southwestern Puerto Rico located on southern coast, bordering the Caribbean Sea, south of Sabana Grande, east of Lajas, and west of Yauco. It is part of the Yauco Metropolitan Statistical Area....

 in the Guánica State Forest

Guánica State Forest

The Guánica State Forest is a subtropical dry forest located in southwest Puerto Rico. The area was designated as a forest reserve in 1919 and a United Nations Biosphere Reserve in 1981...

. It was first lit in 1893 and deactivated on 1950. The light marked the entrance to Guánica Bay and bridge the gap between Los Morrillos Light and Caja de Muertos Light

Caja de Muertos Light

Caja de Muertos Light, is an 1887 lighthouse in Ponce, Puerto Rico, that is unique amongst all other lighthouses in Puerto Rico for its unusual Lorraine cross, double-arm, T-type shape structure. The historic lighthouse is located in Caja de Muertos, an uninhabited island off the coast of Ponce,...

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In July 1898, lighthouse keeper Robustiano Rivera spotted the convoy of the American forces that initiated the landing offensive of the Puerto Rican Campaign

Puerto Rican Campaign

The Puerto Rican Campaign was an American military sea and land operation on the island of Puerto Rico during the Spanish–American War. The offensive began on May 12, 1898, when the United States Navy attacked the archipelago’s capital, San Juan. Though the damage inflicted on the city was minimal,...

 during the Spanish–American War. He immediately gave the alert to the residents of Guánica and marched to Yauco where he broke the news of the invading forces to the city's mayor.

The lighthouse is practically in ruins, though some parts of its unique architectural elements are still visible. It was listed in the U.S. National Register of Historic Places in 1981.