Stratus clouds are found low in the atmosphere, typically below 6,500 feet (2,000 meters). They often form a gray, featureless sheet covering the entire sky.

Here's a more detailed breakdown:

* Low-level clouds: Stratus clouds are a type of low-level cloud, meaning they form in the lowest layer of the atmosphere called the troposphere.

* Near the ground: They can sometimes even appear to touch the ground, forming fog.

* Wide range of altitudes: While generally considered low-level, they can sometimes extend up to 20,000 feet (6,000 meters).

It's important to remember that the exact altitude of stratus clouds can vary depending on location, season, and other weather conditions.