page_title: Mare Tyrrhenum quadrangle
hierarchical_section_title: Mare Tyrrhenum quadrangle
caption_attribution_description: English: PIA00182: MC-22 Mare Tyrrhenum Region http://photojournal.jpl.nasa.gov/catalog/pia00182 Mars digital-image mosaic merged with color of the MC-22 quadrangle, Mare Tyrrhenum region of Mars. Heavily cratered highlands dominate the Mare Tyrrhenum quadrangle. The central part is marked by a large shield volcano, Tyrrhena Patera, and associated ridged plains of Hesperia Planum that probably are made up of basaltic lava flows. Latitude range -30 to 0 degrees, longitude range -135 to -90 degrees.
context_page_description: The Mare Tyrrhenum quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. This quadrangle is also referred to as MC-22. It contains parts of the regions Tyrrhena Terra, Hesperia Planum, and Terra Cimmeria.
  The Mare Tyrrhenum quadrangle covers the area from 225° to 270° west longitude and 0° to 30° south latitude on Mars. Schiaparelli named the area after Earth's Tyrrhenian Sea, which lies between Italy and Sicily. The region was subsequently renamed to Mare Tyrrhena after spacecraft photos revealed that it is an old, cratered plain rather than a sea. It contains the large volcano Tyrrhenus Mons, one of the oldest, and perhaps the most complex volcanoes on Mars. Mare Tyrrhenum's largest crater is Herschel. Licus Vallis and the Ausonia Montes are other major features in the region.
context_section_description: The Mare Tyrrhenum quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. This quadrangle is also referred to as MC-22 (Mars Chart-22).  It contains parts of the regions Tyrrhena Terra, Hesperia Planum, and Terra Cimmeria.
  The Mare Tyrrhenum quadrangle covers the area from 225° to 270° west longitude and 0° to 30° south latitude on Mars. Schiaparelli named the area after Earth's Tyrrhenian Sea, which lies between Italy and Sicily. The region was subsequently renamed to Mare Tyrrhena after spacecraft photos revealed that it is an old, cratered plain rather than a sea. It contains the large volcano Tyrrhenus Mons, one of the oldest, and perhaps the most complex volcanoes on Mars. Mare Tyrrhenum's largest crater is Herschel. Licus Vallis and the Ausonia Montes are other major features in the region.
caption: Image of Mare Tyrrhenum quadrangle (MC-22). Most of the region contains heavily cratered highlands. The central part contains Tyrrhena Patera and the associated ridged plains of Hesperia Planum.
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