Noctis Labyrinthus
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![In this image, the canyons are filled with mist from frost sublimated by the early-morning sun. (South is toward the top.) Courtesy NASA/JPL-Caltech.](/encyclopedia/images/thumb/c/cc/180px-NoctisLaby-PIA03213_modest.jpg)
In this Viking 1 image, the canyons are filled with mist from frost sublimated by the early-morning sun. (South is toward the top.) Courtesy NASA/JPL-Caltech.
Noctis Labyrinthus, "the labyrinth of the night", is a region of Mars between the Valles Marineris and the Tharsis upland. The region is notable for its maze-like system of deep, steep-walled valleys.