Four Views of Mars in Northern Summer

The Tharsis volcanos and associated clouds are prominent in the western half of this view. Olympus Mons, spanning 340 miles (550 km) across its base and reaching an elevation of 16 miles (25 km), extends through the cloud deck near the western limb, while (from the south) Arsia Mons, Pavonis Mons, and Ascraeus Mons are to the west of center.

Valles Marineris stretches to the east, and the Pathfinder landing site is shrouded in clouds near the afternoon limb.