Bonilla-Bonillita Lacustrine Wetland (Spanish: Humedal Lacustrino Bonilla-Bonillita) is a protected area in Costa Rica, managed under the Caribbean La Amistad Conservation Area and created in 1994 under decree 23004-MlRENEM to protect the Lake Bonilla, Lake Bonillita on the west side of Reventazón River, and Lake Lancaster Arriba and Lake Lancaster Abajo on the east side of Reventazón River.