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 sand dunes within Proctor Crater. These dunes are composed of basaltic sand that has collected in the bott...

This image from NASAs Mars Odyssey shows a portion of Sirenum Fossae. The linear features are tectonic graben. Graben are formed by extension of th...

This image from NASAs Mars Odyssey shows part of the large sand sheet with surface dune forms on the floor of Charlier Crater in Terra Sirenum.

This image from NASAs Mars Odyssey shows part of Charitum Montes, the rugged highlands surrounding the southern part of Argyre Planitia.

This image from NASAs Mars Odyssey shows linear features which are tectonic graben. These graben are called Sirenum Fossae.

This image from NASAs Mars Odyssey shows a sand sheet with surface dune forms as well as smaller sand dunes within an unnamed crater in Noachis Terra.

This image from NASAs Mars Odyssey shows an unnamed region of fractures and graben, located south of Solis Planum, between Claitas Fossae and Corac...

This image from NASAs Mars Odyssey shows a line of clouds over the south polar cap.

This image from NASAs Mars Odyssey shows layering in the south polar cap. The layers are formed over thousands of years of seasonal change, reflect...

This image from NASAs Mars Odyssey shows a large sand sheet with surface dune forms as well as smaller sand dunes within an unnamed crater in Noach...

This image from NASAs Mars Odyssey shows a section of Tader Valles located in Terra Sirenum. Tader Valles is 200 km long (124 miles).

This image from NASAs Mars Odyssey shows Claritas Fossae, a graben filled highland, is located between the lava plains of Daedalia Planum and Solis...

This image from NASAs Mars Odyssey shows part of Mangala Fossae. Fossae are long linear depressions called a graben and were formed by extension of...

This image from NASAs Mars Odyssey shows Cavi Angusti, located near the south polar cap. It consists of large irregular steep-sided depressions ter...

This image from NASAs Mars Odyssey shows a short section of Reull Vallis. Reull Vallis starts in Promethei Terra and empties into Hellas Plainitia.

This image from NASAs Mars Odyssey shows sand dunes within Proctor Crater. These dunes are composed of basaltic sand that has collected in the bott...

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows part of the south polar cap. Taken in summer, the CO2 (dry ice) cap shows the layering of ice and dust tha...

This image from NASAs Mars Odyssey shows two small landslide deposits within a crater.

This image from NASAs Mars Odyssey shows Claritas Fossae is a graben filled highland, located between the lava plains of Daedalia Planum and Solis ...

This image from NASAs Mars Odyssey shows part of a crater and its ejecta. Located in Noachis Terra, this impact crater is not the typical round shape.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows part of the floor of Hale Crater and the elongate axis of the central peak mountains.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows part of the floor of Eberswalde Crater.

This image from NASAs Mars Odyssey shows a short section of Reull Vallis. Reull Vallis starts in Promethei Terra and empties into Hellas Plainitia.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows part of the southern flank of Arsia Mons. The linear features are graben.

This image from NASAs Mars Odyssey shows a section of Ladon Vallis. The channel is 278km long (173 miles). Ladon Vallis is located in Noachis Terrr...

This image from NASAs Mars Odyssey shows a small portion of both Dao Vallis and Niger Vallis.

This image from NASAs Mars Odyssey shows Claritas Fossae, a graben filled highland, located between the lava plains of Daedalia Planum and Solis Pl...

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows an unusual layer of smooth material covering the flanks of the volcano Peneus Patera just south of the Hel...

This image from NASAs Mars Odyssey shows part of Ius Chasma and one of its mega gullies.

This image from NASAs Mars Odyssey shows a large sand sheet with surface dune forms as well as smaller sand dunes within an unnamed crater in Noach...

This image from NASAs Mars Odyssey shows Maunder Crater. Its floor has been filled by a significant amount of material.

This image from NASAs Mars Odyssey shows a small section of Nirgal Valles. Located in Noachis Terra, Nirgal Valles is 610km long (379 miles).

This image from NASAs Mars Odyssey shows part of Ariadnes Colles. The term colles means hills or knobs.

This image from NASAs Mars Odyssey shows Claritas Fossae, a graben filled highland, located between the lava plains of Daedalia Planum and Solis Pl...

This image from NASAs Mars Odyssey shows many individual dunes located in Kaiser Crater.

This image from NASAs Mars Odyssey shows a portion of Sirenum Fossae. The linear features are tectonic graben.

This image from NASAs Mars Odyssey shows complex dune forms located on the floor of Russell Crater.

This image from NASAs Mars Odyssey shows a portion of Sirenum Fossae. The linear features are tectonic graben.

This image from NASAs Mars Odyssey shows part of the floor of Rabe Crater.

This image from NASAs Mars Odyssey shows graben at the top of the image, Mangala Fossae, the rest are part of Memnonia Fossae.

This image from NASAs Mars Odyssey shows a complex channel, part of Mangala Fossae.

This image from NASAs Mars Odyssey shows sand dunes within an unnamed creater in Noachis Terra.

This image from NASAs Mars Odyssey shows the delta deposit on the floor of Eberswalde Crater.