At the lower left are long flow-ridges, some of which extend for several hundred kilometers. The flat-topped lava flows are generally considered to have been fed by lava tubes. One flow has a sinuous channel tube running along the crest of the ridge. Superposed craters on Alba Patera are more numerous than on Olympus Mons and Arsia Mons, suggesting an older age for many of these flows. The image is about 100 km across.
North is to the upper left.