Tahoma Glacier. On the southwest slope of the mountain, beginning at Sunset Amphitheatre and draining into the South Fork of the Puyallup River. Just south of this glacier is another called South Tahoma Glacier, which drains into Tahoma Creek, which in turn flows into the Nisqually River at the southwestern corner of the Park. The name is one of the forms of the word Tacoma. Stevens and Van Trump gave the name to what is now known as Liberty Cap at the summit. The name is also applied to a most prominent peak on the eastern slope of the mountain. See Little Tahoma.
Tamanos Mountain. Near the east-central boundary of the Park. The name is apparently one way of spelling the Chinook jargon word meaning "spirit."
Tato Falls. On the southern slope, near the foot of Nisqually Glacier. The name was suggested by Superintendent Ethan Allen.
Tatoosh Range. Near the south-central boundary of the Park. The Indian word is said to mean "nourishing breast." A stream from the mountains is called Tatoosh Creek. Highest elevation, at Unicorn Peak, 6,939 feet above sea level.
Tenas Creek. Flowing from Mount Wow across the boundary in the southwest corner of the Park. The name is from the Chinook jargon meaning "little."
The Burn. Near the southern boundary of the Park. The name is too suggestive of a departed forest.
The Castle. A part of the Tatoosh Range, in the southern portion of the Park.
The Fan. On the southeastern slope, just south of the lower part of Cowlitz Glacier. It is a lake whose name was suggested by its shape.
The Palisades. A ridge jutting northwestward from Sourdough Mountains, in the northeastern part of the Park.
The Ramparts. See Rampart Ridge.