This dataset depicts the boundary of the Coastal Plain (1002 Area) of the Arctic National Wildlife Refuge in Alaska. It was created using the legal description that is contained in the following document:

• Tax Cuts and Jobs Act, Title II, Section 20001(a)(1), pp. 182-183 (November 2, 2017)

This description includes marine lagoons in the vicinity of Kaktovik as part of the Coastal Plain, and excludes most Kaktovik Inupiat, Inc. conveyed land from the Coastal Plain. This depiction of the Coastal Plain is the most current (as of November 2017) and supersedes all previous versions of the Coastal Plain boundary as it relates to oil and gas purposes authorized by the 2017 Tax Cuts and Jobs Act. Further confirmation of this depiction of the Coastal Plain boundary was provided by the Anchorage, Alaska Regional Solicitor's Office in the following e-mail memo on November 12, 2020:

"Notwithstanding prior differing definitions of the ANWR "Coastal Plain" contained in 50 CFR Part 37 and former proposed legislation, the maps referenced in Section 20001(a)(1) of the Tax Act are controlling for defining/depicting the "Coastal Plain" for purposes of the new oil and gas program established under the Tax Act, and for that purpose only. In that regard, the "Coastal Plain" is whatever Congress said it is. USGS is not at liberty to "correct" the maps. Changing them would take an act of Congress. As, you know, the lagoons are included within the Coastal Plain on the Tax Act maps.

Additionally, although the definition of "Coastal Plain" in 50 CFR Part 37 differs from that of the Tax Act, those regulations and associated statutory provisions in Section 1002 of ANILCA expired in April 1987, when DOI submitted the report to Congress under Section 1002(h) of ANILCA. In short, FWS's Coastal Plain geological and geophysical program no longer exists. Accordingly, there is no longer a need or opportunity to apply, or depict on a map, the Part 37 definition of "Coastal Plain". "

Those portions of the boundary that follow township and section lines were snapped to the Bureau of Land Management's Alaska PLSS digital dataset. All other portions of the Coastal Plain boundary are coincident with, and were obtained from, the U.S. Fish & Wildlife Service's Arctic National Wildlife Refuge digital boundary dataset. The northern seaward coastline was derived from the current Arctic National Wildlife Refuge boundary as maintained in the USFWS Division of Realty, Anchorage, Alaska digital GIS database.

This Coastal Plain dataset was created by the USFWS, Region 7, Division of Realty, on November 12, 2020 using ArcGIS 10.7.1.