Tendril Canyon is a landform on the planet Shi. It is much smaller than the nearby Mandible Canyon, but is still considered to be a large and impressive sight. A base of Terran Confederacy holdouts was established near the canyon.
In 2501, a group of children from former Confederate Old Families stopped at the canyon after visiting the world. Unbeknownst to them, the Terran Dominion had ordered a zerg drone to be released in the area, and a hive cluster was set up. The zerg infested a guard name Jakk, who lead the zerg to the base where the Old Families had stopped near the canyon. The zerg overran the base, but the children of the Old Families were able to escape.