The Footprint is a heavily forested region in Essos, stretching along the coast of the Shivering Sea north of Vaes Dothrak. The island of Ibben lies off the coast of this region. This area is separated from the Dothraki sea to the south by a range of mountains.
In the books
In the A Song of Ice and Fire novels, the Footprint has not yet been mentioned. It has only appeared on HBO's maps for the TV series. The corresponding region (south of Ibben but north of Vaes Dothrak) in the map later released in the Lands of Ice and Fire collection is known as the "Kingdom of the Ifequevron". As with other kingdoms of central Essos it was devastated during the first great wave of Dothraki raids following the Doom of Valyria, during the Century of Blood. "The Footprint" might be an alternate name for the same geographical region.