Geologic map of the Sinus Sabaeus quadrangle of Mars

The Sinus Sabaeus quadrangle lies in the southern equatorial region of Mars. It is bounded on the north by the equator, on the west by the central meridian, on the south by lat 30 degrees S., and on the east by long 315 degrees W. Three classical regions that have low albedos occur within the quadrangle (Lowell Observatory, 1971): (1) half of Sinus Meridiani occupies part of the northwest corner of the quadrangle; (2) Sinus Sabaeus forms a broad east-west band 180 to 360 km wide across the upper part of the quadrangle along lat 10 degrees S.; and (3) Serpentis Minor occupies the southeast corner. The classical high-albedo regions of Deucalionis Regio and Pandorae Fretum occupy the western and central southern parts of the quadrangle; Edom and Typhon, the north-central and northeast part; and Fastigium Aryn, part of the northwest corner. These classical light-and-dark regions can be recognized, in a general way, on Mariner 9 pictures. Serpentis Minor, Sinus Sabaeus, and eastern Sinus Meridiani have a striking mottled light-and-dark appearance. Deucalionis Regio and Pandorae Fretum have a uniform gray appearance. Edom is smooth and bright appearing, Fastigium Aryn and Typhon, bright and weakly mottled.