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Constructed wetland to treat gray water from homes in Mexico.

Sampling location near a port for large ships that dumps out their bilge water.

Rivera Maya beach: This is a control location because it should not contain contamination.

Sinkhole in Yucatan Mexico.  The depth is greater than 110m and crosses the fresh/salt water interface at around 60m.

Sinkhole in Yucatan Mexico. This location is being sampled to determine the types of microorganisms living there.