The Valley of Hands is a bog at the bottom of the ocean, near Atlantis. In ancient times, a race of giant humanoids attacked Atlantis. Atlantean weapons couldn't destroy them, but they sank in the bog and got stuck, only their outstretched hands remaining visible. As Jerro the Merman states, "They'll live in that trapped state for a thousand years more" so the region is still dangerous. In 1961, Lenora Lemaris blundered into the region and got captured by one of the hands, forcing Supergirl and Jerro to come save her. ("The Strange Bodies of Supergirl!")