The cape resembles a letter Y with its two promontories or morrillos being connected through sand pits which enclose a saltwater lagoon.

The landform was designated a National Natural Landmark in 1980 (as the Cabo Rojo National Natural Landmark), and the site includes mangroves, beaches, important bird nesting areas, limestone caves, cliffs and rock formations.

The site is located in and administered by the Boquerón State Forest and the Cabo Rojo National Wildlife Refuge.

[3][4] This landform is located in the southwestern corner of the main island of Puerto Rico, shared by the barrios Boquerón and Llanos Costa of the municipality of Cabo Rojo.

[5] The geology of the landform consists mainly of limestone and serpentine rock formations, some of which are considered amongst the oldest in Puerto Rico.