Two circular features have been spotted near the town of Nampa in SW Oregon.  The circles are approximately 210-240+ feet wide.

The circular feature is approximately 170 feet in diameter.

Circular and linear features in the region of Moquegua Peru.  The area spans a distance of 2 miles before the circular features start to disappear within the landscape.

Several, large. circular features have been found in the Harney Basin, South East corner of Oregon.  The features are quite large and several circular features can be seen.  The most prominent feature is over 800 feet wide and contains five concentric rings. 

Carolina Bays are considered anomalies by many scientists.  The formation or cause of these oval, circular features has yet to be determined.

Circular, oblong features aligned in rows off the Southern tip of Florida within the Florida Everglades.