This image from NASAs Mars Odyssey shows part of the northwestern upper flank of Ascraeus Mons.

This image from NASAs Mars Odyssey shows part of Athabasca Valles. Several streamlined islands are visible, with tails pointing downstream.

This image from NASAs Mars Odyssey shows part of Chia Crater. Chia Crater is 92 km (57 miles) in diameter and is located in Xanthe Terra just east ...

This image from NASAs Mars Odyssey shows part of the northern rim of Huygens Crater.

This image from NASAs Mars Odyssey shows a cross section of Hebes Chasma, including Hebes Mensa.

This image from NASAs Mars Odyssey shows part of Oenotria Scopuli, which is the bright cliff in the center of the image. Oenotria Scopuli is locate...

This image from NASAs Mars Odyssey shows the rim of an unnamed crater on the floor of the much larger Schroeter Crater.

This image from NASAs Mars Odyssey shows part of Margaritifer Terra just east of Ares Vallis.

This image from NASAs Mars Odyssey shows part of the vast volcanic plains in the Tharsis region, in this case east of Pavonis Mons.

This image from NASAs Mars Odyssey shows part of the eastern boundary of Syrtis Major Planum. The channel at the bottom of the image is unnamed.

This image from NASAs Mars Odyssey shows part of northern Arabia Terra. Arabia Terra is one of the oldest surface regions on Mars and contains a la...

This image from NASAs Mars Odyssey shows part of Nili Fossae. Nili Fossae is a collection of curved faults and down-dropped blocks of crust between...

This image from NASAs Mars Odyssey shows a cross section of Gale Crater, including the large layered deposit in the center of the crater.

This image from NASAs Mars Odyssey shows part of Lomonosov Crater. Lomonosov Crater is 130km (81 miles) in diameter and is located in northern Acid...

This image from NASAs Mars Odyssey shows part of Lomonosov Crater. Lomonosov Crater is 130km (81 miles) in diameter and is located in northern Acid...

This image from NASAs Mars Odyssey shows a cross section of Crommelin Crater.

This image from NASAs Mars Odyssey shows part of northern Syrtis Major Planum.

This image from NASAs Mars Odyssey shows part of northwestern Arabia Terra.

This image from NASAs Mars Odyssey shows part of Terra Sabaea.

This image from NASAs Mars Odyssey shows part of Arabia Terra. Arabia Terra is one of the oldest surface regions on Mars and contains a large varie...

This image from NASAs Mars Odyssey shows part of Terra Sabaea.

This image from NASAs Mars Odyssey shows a cross section of Bamberg Crater.

This image from NASAs Mars Odyssey shows part of Arabia Terra. Arabia Terra is one of the oldest surface regions on Mars and contains a large varie...

This image from NASAs Mars Odyssey shows part of Argentea Planum. The edge of the south polar cap is visible.

This image from NASAs Mars Odyssey shows part of Angustus Labyrinthus. Angustus Labyrinthus is a unique region near the south polar cap.

This image from NASAs Mars Odyssey shows part of Angustus Labyrinthus. Angustus Labyrinthus is a unique region near the south polar cap.

This image from NASAs Mars Odyssey shows part of Australe Montes. This region of highlands is located near the south polar cap.

This image from NASAs Mars Odyssey shows part of Sirenum Fossae. The linear depressions are tectonic graben.

This image from NASAs Mars Odyssey shows part of the floor of Kaiser Crater. Kaiser Crater is located in Noachis Terra west of Hellas Planitia.

This image from NASAs Mars Odyssey shows part of Sirenum Fossae. The linear depressions are tectonic graben.

This image from NASAs Mars Odyssey shows part of Sirenum Fossae. The linear depressions are tectonic graben.

This image from NASAs Mars Odyssey shows part of Atlantis Chaos. Chaos terrain is typified by regions of blocky, often steep sided, mesas intersper...

This image from NASAs Mars Odyssey shows the floor of Matara Crater. A large sand sheet dominates the floor of this crater located in Noachis Terra.

This image from NASAs Mars Odyssey shows part of Sirenum Fossae. The linear depressions are tectonic graben.

This image from NASAs Mars Odyssey shows some of the graben that comprise Sirenum Fossae.

This image from NASAs Mars Odyssey shows several craters in Terra Cimmeria.

This image from NASAs Mars Odyssey shows Tiu Valles, part of a large system of channels that arise from Vallis Marineris and flow northward to empt...

This image from NASAs Mars Odyssey shows part of Indus Vallis, located in northern Terra Sabaea.

This image from NASAs Mars Odyssey shows several linear depressions that comprise of Amenthes Fossae.

This image from NASAs Mars Odyssey shows part of Hephaestus Fossae. Hephaestus Fossae is a complex channel system in Utopia Planitia near Elysium M...

This image from NASAs Mars Odyssey shows a section of Cerberus Fossae.

This image from NASAs Mars Odyssey shows part of Karzok Crater. This crater is one of two located on the flanks of Olympus Mons.

This image from NASAs Mars Odyssey shows a portion of Shalbatana Vallis.

This image from NASAs Mars Odyssey shows Olympia Undae in the middle of north polar spring.

This image from NASAs Mars Odyssey shows part of the eastern flank of Pavonis Mons. Pavonis Mons is the central volcano of the three large Tharsis ...

This image from NASAs Mars Odyssey shows a cross section of Elysium Mons, including the entire summit caldera.

This image from NASAs Mars Odyssey shows a portion of an unnamed channel in northern Arabia Terra.

This image from NASAs Mars Odyssey shows the rugged region called Nepenthes Mensae, between the highlands of Terra Cimmeria and the low plains of N...

This image from NASAs Mars Odyssey shows the ridge forms that are typical of this region of Lycus Sulci, northwest of Olympus Mons.

This image from NASAs Mars Odyssey shows part of Xanthe Chaos. Xanthe Chaos is a small region of mesas located within Shalbatana Vallis.