It is currently cultivated and is very clearly visible from air as a large, circular field.

In the circular field of vision I could see their heads, below in the courtyard.

And what about those circular fields in the West?

The circular field is surrounded by the name of the team on a red background.

The shirt included a red armband with a black swastika set inside a circular field of white.

Contenders began in the center of a circular field.

The game is played on a circular field with a central goal.

Their turrets swiveled to allow gun and camera sight to cover a circular field of fire.

Their circular field was the only land in view that wasn't erupting with freakish new life.

This effect is encouraged by the banding (or lack of it) within the circular field.