The Spanish Lagoon is a coastal lagoon located in the Caribbean region of Puerto Rico. It is known for its rich biodiversity, including various species of fish, birds, and plant life. The lagoon serves as an important habitat for wildlife and is a popular spot for recreational activities such as kayaking and birdwatching. The lagoon is part of the larger San Juan Bay system and is influenced by both freshwater and saltwater. Its unique ecosystem plays a crucial role in maintaining the environmental balance in the area, making it a significant site for conservation efforts and ecological studies.