The Arabia quadrangle has both highland materials of Terra Sabaea and transition materials of Arabia Terra, including a portion of Meridiani Planum. Craters dominate the landscape, with Arago, Capen, Cassini, Gill, Henry, Janssen, Pasteur, Teisserenc de Bort, Tikhonravov, and Tuscaloosa. The longest valleys are Naktong, Scamander, and Indus Valles. The topography slopes from 1 km above datum in the southeast down to 2 km below datum in the northwest. Across this transition, the southeastern, topographically irregular, densely cratered Terra Sabaea gives way to the moderately impacted, but smoother, intercrater plains of Arabia Terra. Degraded domical mounds are present in several craters, most notably Henry, but are not present in all the craters along the boundary between the higher-standing Terra Sabaea and Arabia Terra.