Scientists who study Dead Sea sinkholes come to know them in particular ways (as generalized hydrogeoloic phenomena, symptoms of a regional environmental crisis, or divine retribution) and at particular scales (from the distant orbit of Earth observation satellites, from digitally altered aerial photographs, and occasionally from the inside). Using ethnographic data gathered between 2012 and 2015 in the occupied Palestinian territories (oPt), Israel, and Jordan, I compare how groups and individuals study, think, and learn about Dead Sea sinkholes. The way hydrogeologic knowledge about these sinkholes is gathered and circulated helps define land around the Dead Sea as territory to be colonized. These scientific processes can nullify Palestinian claims to the Dead Sea, eliminate Palestinian people from Dead Sea landscapes, and marginalize Bedouin opposition to Jordanian government policies. I suggest that attention to “geologies of erasure” helps scholars to understand the scientific and political impacts of settler colonialisms on the collection of knowledge about changing natural environments in the Middle East and beyond.