  In recent decades, state legislatures have often drawn U.S. Congressional
voting districts that look---to the human eye---to be rather twisted. In this
paper, we propose a method to measure how much districts "meander" via a
computation of the medial axis of the region. We then compare this to the
medial axis of the convex hull of the district to obtain the {\em medial-hull
ratio}: a dimensionless quantity that captures the district's irregularity. We
compute this quantity for many example Congressional districts.
