Syrtis Major
[ sur-tis ]
/ ˈsɜr tɪs /
noun
an area in the northern hemisphere and near the equator of Mars, appearing as a dark region when viewed telescopically from the earth.
British Dictionary definitions for syrtis major
Syrtis Major
/ (ˈsɜːtɪs) /
noun
a conspicuous dark region visible in the N hemisphere of Mars