The Valley of Broken Glass is a small desert valley with a sand-covered floor. Though not seen, as its name implies, the valley is filled with countless broken glass shards of unknown origin. Any unprotected traveler can thus not get through this valley without severe cuts.
The Valley of Broken Glass lay on the route of Sonic and Knuckles' wheelbarrow race. Since Knuckles (who played the role of the Wheelbarrow) could not keep up with Sonic, the echidna received several injuries when they passed through the valley.