River Tigris, the Tigris river:

A seldom mentioned constellation that was once placed near the shoulder of Ophiuchus, the serpent-bearer. The constellation was created by the German astronomer Jakob Bartsch during the seventeenth century. River Tigris began at Ophiuchus then it meandered its way between Aquila, Hercules, Cygnus, Sagitta, Equuleus, and finally ended near Pegasus. The constellation appear on a few subsequent star atlases, but never found wide acceptance and was quickly forgotten. Some of the stars of River Tigris became part of another obsolete constellation, Taurus Poniatovii, Poniatowski's bull.