Sediments and phytoplankton growth gives the waters of the Términos Lagoon a bright green color. This body of water is made up of a series of rich, sediment-laden lagoons and tidal estuaries connected by two channels to the Bay of Campeche in the southern part of Gulf of Mexico. It is located in Carmen Municipality in the southwestern part of the Mexican state of Campeche.
The lagoon’s shores are swampy and support mangroves, and twenty-nine percent of the lagoon is covered with seagrass. It is fed by several fresh water rivers, including the Mezcapala, Grijalva and Usumacinta Rivers, and includes several lagoons such as Pom, Atasta, Puerto Rico, Este and Panlau. It is about 112.5 square km in area (about 50 miles long and 20 miles wide). Every nine days, approximately 50% of the lagoon’s water volume is renewed, primarily through the effect of ocean tides.