[Glenn Wright]

Hi, Joe—

I don’t live in the UK, so my grasp of English geography is a bit muddled. At first I thought you might be referring to the chalk horses carved into the hillsides in Wiltshire, but after a bit of research, I found the place where M40 is actually cut into the chalk hills as if by the hand of God.

I wonder if “circumscribed” is exactly the word you want. How about “deep incised?” I guess it depends on whether you want to emphasize the tightness and restriction of the chalk walls or the depth and precision of the cut.

Glenn