The Sommerkahl is a left tributary of the Kahl in the northern Spessart in Lower Franconia, Bavaria, Germany. It is 5 km (3,1 mi) long. From the headwaters to the entrance of Sommerkahl the stream is called Speckkahl ("Bacon kahl"). This name comes from a time, when people wore their ham and bacon, along the creek from Sommerkahl to Jakobstal, to action. The Speckkahl rises in the nature reserve "Amphibienfreistätte Speckkahl".