Vastitas Borealis (Latin 'northern waste') is the largest lowland region of Mars. It is in the northerly latitudes of the planet and encircles the northern polar region. Vastitas Borealis is often simply referred to as the northern plains, northern lowlands or the North polar erg of Mars. The plains lie 4–5 km below the mean radius of the planet, and is centered at 87°44′N 32°32′E / 87.73°N 32.53°E. A small part of Vastitas Borealis lies in the Ismenius Lacus quadrangle.