The area of Apoyo Lagoon Natural Reserve is 34.997 square kilometers.
The area of Tiscapa Lagoon Natural Reserve is 396,591.9293952 square meters.
The area of Guembeul Natural Reserve is 7,200,000.0 square meters.
The area of McLaughlin Natural Reserve is 28.53 square kilometers.
The area of Old Providence McBean Lagoon National Natural Park is 9,950,000.0 square meters.
The area of Azalea State Natural Reserve is 121,405.692672 square meters.
The area of Armstrong Redwoods State Natural Reserve is 3,043,236.0296448004 square meters.
The area of Chocoyero-El Brujo Natural Reserve is 1,841,319.672192 square meters.
A nature reserve.
Ahihi-Kinau Natural Area Reserve was officially established in 1973 to protect the unique and fragile ecosystems found in the area, including volcanic features, lava fields, and nearshore marine environments.
The area of Private Reserve of Natural Heritage of University of Santa Cruz do Sul is 2,213,900.0 square meters.
The area of Akyatan Lagoon is 147.008 square kilometers.
The area of Murtnaghurt Lagoon is 810,000.0 square meters.