| Mount Rainier | |
| Other Name: | Tahoma |
| Etymology: | Peter Rainier |
| Elevation Ft: | 14,411 |
| Elevation Ref: | [1] |
| Prominence Ft: | 13,246 |
| Isolation Mi: | 731 |
| Parent Peak: | Mount Massive, United States of America |
| Range: | Cascade Range |
| Country: | United States |
| State: | Washington |
| Subdivision2 Type: | County |
| Subdivision2: | Pierce County |
| Part Type: | Protected area |
| Part: | Mount Rainier National Park |
| Map: | USA Washington |
| Label Position: | left |
| Coordinates: | 46.8531°N -121.7606°W |
| Topo: | USGS Mount Rainier West |
| Type: | Stratovolcano |
| Age: | 500,000 years |
| Volcanic Arc: | Cascade Volcanic Arc |
| First Ascent: | 1870 by Hazard Stevens and P. B. Van Trump |
| Easiest Route: | rock/ice climb via Disappointment Cleaver |
Mount Rainier, also known as Tahoma, is a large active stratovolcano in the Cascade Range of the Pacific Northwest in the United States. The mountain is located in Mount Rainier National Park about 59miles south-southeast of Seattle.[2] With a summit elevation of 144110NaN0,[3] it is the highest mountain in the U.S. state of Washington, the most topographically prominent mountain in the contiguous United States,[4] and the tallest in the Cascade Volcanic Arc.
Due to its high probability of an eruption in the near future and proximity to a major urban area, Mount Rainier is considered one of the most dangerous volcanoes in the world, and it is on the Decade Volcano list.[5] The large amount of glacial ice means that Mount Rainier could produce massive lahars that could threaten the entire Puyallup River valley and other river valleys draining Mount Rainier, including the Carbon, White, Nisqually, and Cowlitz (above Riffe Lake).[6] According to the United States Geological Survey, "about 80,000 people and their homes are at risk in Mount Rainier's lahar-hazard zones."[7]
Between 1950 and 2018, 439,460 people climbed Mount Rainier.[8] [9] Approximately 84 people died in mountaineering accidents on Mount Rainier from 1947 to 2018.[8]
The many Indigenous peoples who have lived near Mount Rainier for millennia have many names for the mountain in their various languages.