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An orbital image of the Martian surface taken by Tianwen-1, showing the region of Protonilus Mensae in the Ismenius Lacus quadrangle. The landscape features a mix of rugged, eroded mesas and numerous impact craters. Near the bottom, an eroded landform resembles the shape of an ancient riverbed. The terrain varies in colour from warm rusty reddish tones to more brownish, with contrasting light and dark shading that reveals surface textures and elevation changes. Very light cloud cover is visible near the top of the image, softening the details in that region. Toward the right side, a distinct, bright white cloud casts a soft shadow, standing out sharply against the rusty ground. The overall scene conveys the dry and rocky, yet ancient and geologically complex nature of the Martian terrain.