Naktong Vallis is an ancient river valley in the Arabia quadrangle

Arabia quadrangle

The Arabia quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. The Arabia quadrangle is also referred to as MC-12 ....

 of Mars

Mars

Mars is the fourth planet from the Sun in the Solar System. The planet is named after the Roman god of war, Mars. It is often described as the "Red Planet", as the iron oxide prevalent on its surface gives it a reddish appearance...

, located at 5.3 degrees north latitude and 327.1 degrees west longitude. It is 494 km long and was named after a river in Korea.

Naktong Vallis is part of the Naktong/Scamander/Mamers Valles lake-chain system that is comaparable in length of Earth's largest system, like the Missouri-Mississippi.