Dramatic flood events carved this impressive channel system on Mars covering 1.55 million square kilometres, shown here in a stunning new mosaic from ESA's Mars Express.
The mosaic, which features the spectacular Kasei Valles, comprises 67 images taken with the spacecraft's high-resolution stereo camera and is released during the week of the 10th anniversary of the spacecraft's launch to the Red Planet.
Kasei Valles is one of the largest outflow channel systems on Mars – from source to sink, it extends some 3000 km and descends by 3 km in altitude.
The scene covered in the mosaic spans 987 km north–south (19–36°N) and 1550 km east–west (280–310°E).
The channel originates beyond the southern edge of this image near Valles Marineris, and empties into the vast plains of Chryse Planitia to the east (right).
Kasei Valles splits into two main branches that hug a broad island of fractured terrain – Sacra Mensa – rising 2 km above the channels that swerve around it.
While weaker materials succumbed to the erosive power of the fast-flowing water, this hardier outcrop has stood the test of time.
Slightly further downstream, the flood waters did their best to erase the 100 km-wide Sharonov crater, crumpling its southern rim.
Around Sharonov, many small streamlined islands form teardrop shapes rising from the riverbed, carved as water swept around these natural obstacles.
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