Syrtis Major

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Syrtis Major

(ˈsɜːtɪs)
n
(Astronomy) a conspicuous dark region visible in the N hemisphere of Mars
References in periodicals archive ?
Other structures that can be seen in the photo are Sinus Sabaeus and Sinus Meridiani - long dark features south of Arabia Terra - and the Syrtis Major Planitia - one of the earliest features identified on the surface of the planet.
13 and released last month, shows Syrtis Major Planitia (dark area, middle).