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Connecting federal employees, scientists, educators, and the public with their wilderness heritage
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Data Disclaimer for Databases, Maps, and Published Information

The Federal laws that established individual wilderness units, beginning with the Wilderness Act of 1964 and including all subsequent wilderness legislation, are the legally correct source for the wilderness names, locations, original acreage, and dates of designation. The collection of this data within's National Wilderness Preservation System database began with the following publication, which compiled the legislated acres for all designated wilderness areas: Landres, Peter; Meyer, Shannon. 2000. National Wilderness Preservation System database: key attributes and trends, 1964 through 1999. Gen. Tech. Rep. RMRS-GTR-18-Revised Edition. Ogden, UT: U.S. Department of Agriculture, Rocky Mountain Research Station. 97 p. Download this publication. Current reported acreage figures are the sum of administrative unit acreages reported by the wilderness' managing agency or agencies. Acreage figures for total state land area and Federal Government owned land, used in some charts, are taken from U.S. General Services Administration, Overview of the United States Government's Owned and Leased Real Property: Federal Real Property Profile as of September 30, 2003. See Table 16, GSA website at [ Report FY2003-R4_R2M-n11_0Z5RDZ-i34K-pR.pdf], visited January 30, 2009. The data do not include trust properties. Total land area for Puerto Rico is taken from the U.S. Census Bureau's Geographic Areas Reference Manual, chapter 7, page 8. Subsequent data updates are received from each wilderness management agency's lands office. Data last updated on 12/8/16 (Forest Service acreages updated to be consistent with the 2016 Lands Area Report).'s GIS-based map overlays legislative designated wilderness boundaries on satellite data provided by ESRI and Bing Maps. Boundary updates are obtained from the wilderness management agencies. Boundary names containing "(Draft boundary)" have not been finalized and are not official. Different wildernesses treat inholdings differently, so you should consult agency-specific maps to identify the exact location of private inholdings within wilderness. manages this map as a service to users of digital geographic data. is in no way condoning or endorsing the application of these data for any given purpose. It is the sole responsibility of the user to determine whether or not the data are suitable for the intended purpose. It is also the obligation of the user to apply those data in an appropriate and conscientious manner. Although attempts to use the most current and complete geospatial data available, accuracy varies. provides no warranty, nor accepts any liability occurring from any incorrect, incomplete, or misleading data, or from any incorrect, incomplete, or misleading use of these data.

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