16 U.S.C. § 91

All those certain tracts, pieces, or parcels of land lying and being in the State of Washington, and within the boundaries particularly described as follows, to wit: Beginning at a point three miles east of the northeast corner of township numbered 17 north, of range 6 east of the Willamette meridian; thence south through the central parts of townships numbered 17, 16, and 15 north, of range 7 east of the Willamette meridian, 18 miles more or less, subject to the proper easterly or westerly offsets, to a point three miles east of the northeast corner of township numbered 14 north, of range 6 east of the Willamette meridian; thence east on the township line between townships numbered 14 and 15 north, 18 miles more or less to a point 3 miles west of the northeast corner of township 14 north, of range 10 east of the Willamette meridian; thence northerly subject to the proper easterly or westerly offsets, 18 miles more or less, to a point 3 miles west of the northeast corner of township numbered 17 north of range 10 east of the Willamette meridian (but in locating said easterly boundary, wherever the summit of the Cascade Mountains is sharply and well defined, the said line shall follow the said summit, where the said summit line bears west of the easterly line as herein determined); thence westerly along the township line between said townships numbered 17 and 18 to the place of beginning, are dedicated and set apart as a public park to be known and designated as the Mount Rainier National Park, for the benefit and enjoyment of the people; and all persons who shall locate or settle upon or occupy the same, or any part thereof, except as hereafter provided, shall be considered trespassers and be removed therefrom.