The Gulf of Nicoya is a large estuarine bay located on the Pacific coast of Costa Rica. It is bordered by the Nicoya Peninsula to the west and the mainland to the east. The gulf is known for its rich biodiversity, including various marine species and coastal ecosystems, making it an important area for both conservation and fishing. Several rivers, including the Tempisque River, flow into the Gulf of Nicoya, contributing to its unique ecosystem. The gulf is also home to several islands, such as Isla Tortuga and Isla San Lucas, which attract tourists for their natural beauty and recreational activities.