Emmons Glacier. On the northeastern slope. This is the largest glacier on the mountain. For a long time it was called White Glacier because it gave rise to the river of that name. The river's name came from the glacial whiteness of its waters. The present name is in honor of S. F. Emmons, who, with A. D. Wilson, made the second successful ascent of the mountain in 1870.
Eunice Lake. In the northwest corner of the Park near Tolmie Peak. Bailey Willis named it Tolmie Lake in 1883; but it was not so mapped officially, and the name was changed to honor Mrs. W. H. Gilstrap of Tacoma. She and her husband were frequent visitors to the Crater Lake region.
Fairy Falls. On the southeastern slope, in the upper waters of Stevens Creek. Elevation, 5,500 feet above sea level.
Falls Creek. Rises in North Park and flows across the boundary at the northwestern corner of the Park.
Fay Peak. In the northwestern portion of the Park, overlooking Crater Lake. Elevation, 6,500 feet above sea level. The name was given in honor of Miss Fay Fuller of Tacoma, who in 1890 was the first of her sex to attain the summit of Mount Rainier.
Fir Lake. A small lake in the southeastern corner of the Park.
Fish Creek. A tributary of Tahoma Creek in the southwestern corner of the Park.
Fishers Hornpipe Creek. On the southern slope of the mountain, a tributary of Pyramid creek. Origin of name not ascertained.
Flett Glacier. Near Ptarmigan Ridge on the northwestern slope. The name is in honor of Professor J. B. Flett of Tacoma, one of the most enthusiastic explorers of the mountain.
Florence Peak. In the northwestern corner of the Park. Origin of name not ascertained.