Sinkhole, or 'Cenotes' (IMAGE) United Nations University Caption Sinkholes (or "cenotes") provide a potential route for contamination of the flooded underground cave system aquifers of the Yucatan Peninsula. Credit Hanneke van Lavieren, UNU Institute for Water, Environment and Health Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.