The Laguna de las Marites Natural Monument[1] (Spanish: Monumento Natural Laguna de las Marites), or Las Marites Lagoon Natural Monument, is a protected hypersaline lagoon with Natural Monument status located on the south-east coastal plain of Margarita Island,[2] in Nueva Esparta state in the north-west of Venezuela.

The reserve has an area of 3,674 ha, a maximum elevation of 40 m and an average temperature of 26°C.

The lagoon vegetation is dominated by black and red mangroves.

Aquatic species include lebranche mullet and horse mackerel as well as crabs and smooth and white shrimp.

[4] The reserve has been designated an Important Bird Area (IBA) by BirdLife International because it supports significant populations of scarlet ibises and reddish egrets.