Create a Circular ArcMap Data Frame

Ever wished you could create a circular data frame to highlight an area on your map?  Just follow these steps:

  1. In the data frame properties (Size and Position Tab) make the height and width the same.                           

  2. In the data frame properties (Frame Tab) ►Border Section change the Rounding to 100% ► Background Section change the Rounding to 100%.

Violá!