Mid-Atlantic Gardening: Edging and paths..., 1 by Gitagal

Gitagal wrote:
Many of the original beds (of almost 40 years ago) are edged by massive, rotting-out RR ties. Many of them are almost hollow....."condos" for all kinds of bugs.
Like the far edges of my "YUK" bed and all the shrubbery beds in the front of the House.....

This corner, especially, is where I would like to replace these rotted out ties with some nice, big edging rocks.
Haven't really gone hunting for any---wouldn't know where to begin!