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Lowdown
This image, with north to the top, is of the central portion of the Rachmaninoff basin. According to a report on Mercury's topography published in the journal Science by Maria Zuber and her colleagues, a point in the lower right section of this image (at 27.42° N, 57.22° E) has the lowest elevation in the planet's northern hemisphere — approximately 5.82 km below the reference. (In fact, another location in a crater at 85.45° N, 62.44° E has about the same low elevation as the point in Rachmaninoff.)
Date acquired: July 17, 2011
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington