The Gulches existed on the Outer Rim planet of Crucival. During the Galactic Empire's era, Hazram Namir, a soldier of the Malkhanis clan, spent a period of time in the Gulches. In 6 BBY, while on Crucival, Namir, the Malkhanis soldier, observed an Imperial TIE fighter headed towards a transmitter tower, and remarked that he hadn't frequently seen that particular starfighter in the Gulches.
Alexander Freed mentioned the Gulches in his 2015 novel, Battlefront: Twilight Company.