The Gap Chasm is a deep gorge that bisects the magical land, and it is vaguely based on a railroad track that ran through Anthony's backyard. It is impossibly deep, and guarded at its base by the Gap Dragon (called Stanley Steamer by Princess Ivy and family). For 800 years, the Gap had a massive forget spell on it, causing anyone who strayed too far from the Gap to forget it existed. The spell was cast by Dor during the time of Roogna as he attempted to break up a war between the goblins and harpies. The spell began to break up following the 'time of no magic' caused by Bink, and is generally memorable in contemporary Xanth.