For Ottawa Retaining wall stone, Greely Sand & Gravel Inc. offers Mountain Grey Wall Stone, Bobcat Armour Stone, and Tan Wall stone for larger projects, that create stunning retaining walls and landscape accents. Try using the stone for rock benches or a Natural Playground. They rock in schoolyards! Read more about rock benches here [PDF]. Equipment is required for installation and can be rented from Greely Sand & Gravel Inc.