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EnviroAtlas - Hydrologic Sinks for the U.S. Pacific Territories

Published by U.S. EPA Office of Research and Development (ORD) - Center for Public Health and Environmental Assessment (CPHEA) | U.S. Environmental Protection Agency | Metadata Last Checked: January 27, 2026 | Last Modified: 2025-06-11T00:00:00.000+00:00
This EnviroAtlas GIS dataset represents hydrologic sinks and major depressions in the landscape that are more than 2 meters deep, have a surface area of more than 78 square meters, and are fully on land. The dataset covers nine islands in the U.S. Pacific Territories of Guam, the Northern Mariana Islands, and American Samoa (the nine islands are Guam, Saipan, Tinian, Aguijan, Rota, Tutuila, Ofu, Olosega, and Ta'u) and was created using Digital Elevation Models from NOAA (2019-2022) as well as NOAA CCAP 1m landcover (2020-2021) and NCCOS (NOAA National Centers for Coastal and Ocean Science) shoreline files (2004-2005). This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).

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