The Granicus Valles are a network of valleys in the

Amenthes quadrangle The Amenthes quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Amenthes quadrangle is also referred to as MC-14 (Mars Chart-14). The quadrangle co ...

of Mars, located at 30° north

latitude In geography, latitude is a geographic coordinate system, geographic coordinate that specifies the north-south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from −90° at t ...

and 229° west

longitude Longitude (, ) is a geographic coordinate that specifies the east- west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek lett ...

. They are 750 km long and are named after the ancient name for a river in Turkey. The system has been identified as

outflow channel Outflow channels are extremely long, wide swathes of scoured ground on Mars.Carr, M.H. (2006), ''The Surface of Mars''. Cambridge Planetary Science Series, Cambridge University Press. They extend many hundreds of kilometers in length and are typ ...

s.Carr, M.H. (2006), The Surface of Mars. Cambridge Planetary Science Series, Cambridge University Press.

References

Valleys and canyons on Mars Amenthes quadrangle {{Mars-stub