Kasei Valles
Kasei Valles
PSP_006005_2050  Science Theme: Fluvial Processes
This image was suggested by Kathleen Hartrum's middle school science club at Conestoga Middle School in Beaverton, Oregon. They thought that this region looked like a fork in the river, separated by an island.

This is, in fact, a streamlined island, one of many observed in the large outflow channels on Mars. This outflow channel is called Kasei Valles, and is one of the largest catastrophic outflow channels on Mars. The streamlined island forms as water flows through the channel, but is blocked by some sort of obstacle, such as a crater or other topographic landform. In this HiRISE image, we only see the very tail end of the streamlined island, which is over 118km in length.

The platy surface within the channels has been attributed to either later lava or mud flows along the surface. The island itself is quite dusty and covered in small craters, so the island may be quite old. Along the edge of the island, however, you can see individual layers of rock. These layers represent individual rock units that may be volcanic or sedimentary in origin.

Written by: Alexandra Davatzes  (26 November 2008)
Acquisition date
07 November 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
288.7 km (179.4 miles)

Original image scale range
58.2 cm/pixel (with 2 x 2 binning) so objects ~174 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
45°, with the Sun about 45° above the horizon

Solar longitude
343.4°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  324.8°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (203MB)

IRB color
map-projected   (80MB)

Black and white
map-projected  (80MB)
non-map           (108MB)

IRB color
map projected  (26MB)
non-map           (77MB)

Merged IRB
map projected  (193MB)

Merged RGB
map-projected  (187MB)

RGB color
non map           (74MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.