The Parana valles and basin system is a large (ca. 150 km) basin that used to host a large lake. The lake overflows and resulted in a large outlet canyon, seen flowing to the north (up to the top of the image). Note the abundant valley networks that feed into the lake.
Location on Mars: 23.1°S 10.2°W (https://en.wikipedia.org/wiki/Paran%C3%A1_Valles).
To see this with mapped water systems: https://skfb.ly/o8HKR (see also: https://www.nature.com/articles/s41586-021-03860-1, where these features were published; Goudge et al., 2021, Nature).
Data: MOLA topography (https://tharsis.gsfc.nasa.gov/MOLA/mola.php) and THEMIS images (https://themis.asu.edu/)
Exported from QGIS (vertical exaggeration = 10).