What can you see from South Sister (Three Sisters)?
360° terrain visibility analysis from South Sister (Three Sisters) — observation point at 3,157 m, coordinates 44.1035, -121.7693.
From South Sister (Three Sisters), the terrain-limited line of sight reaches up to 250 km. The single farthest piece of visible terrain lies 250 km to the north-northeast (bearing 13°), at 1,388 m elevation. These results account for Earth's curvature and standard atmospheric refraction, computed from 30-meter resolution Copernicus GLO-30 elevation data across 1,553,968 terrain samples.
Open the interactive visibility map →Visibility by direction
| Direction | Visible distance |
|---|---|
| North | 250 km |
| East | 250 km |
| South | 237 km |
| West | 208 km |
Frequently asked questions
How far can you see from South Sister (Three Sisters)?
On a clear day the terrain allows a line of sight of up to 250 km from South Sister (Three Sisters). The average visible distance across all 360 directions is 151 km. Atmospheric conditions (haze, humidity) usually reduce practical visibility below the terrain-limited maximum.
What is the farthest point visible from South Sister (Three Sisters)?
The farthest terrain visible from South Sister (Three Sisters) lies 250 km to the north-northeast, at an elevation of 1,388 m. Earth's curvature and atmospheric refraction are accounted for in this calculation.
How high is South Sister (Three Sisters)?
The observation point at South Sister (Three Sisters) sits at 3,157 m above sea level (Copernicus GLO-30 elevation model).
How is this visibility map calculated?
UpToWhere traces lines of sight in 360 directions from the observer using 30 m-resolution Copernicus terrain data, correcting for Earth curvature and standard atmospheric refraction. You can run the same analysis for any point on Earth with the free calculator.
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