| Feature on | Mars | | Feature type | Shield volcano
(Equivalent to the albedo formation Syrtis Major) | | Quadrangle | MC-13 Syrtis Major (extending slightly southward into MC-21 Iapygia) | | Areographic coordinates | 9° N, 67° E | | Dimensions | 1,500 km north-south, 1,000 km west-east | | Bounding features | Antoniandi, Isidis Planitia, Terra Sabaea, Terra Tyrrhena | | Interior features | Arena Dorsum, Arnus Vallis, Meroe Patera, Nili Patera |
One of the most recognisable features of the planet Mars is this dark and approximately triangular feature, pointing northwards from the planet's equatorial regions. It is not fixed in size and shape, and tends to expand eastward during the Martian summer.
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