River Tigris (constellation)

thumb | right | alt=A constellation map, with the River Tigris constellation in view | A depiction of the River Tigris constellation

River Tigris or Tigris (named after the Tigris river) was a constellation, introduced in 1612 by Petrus Plancius. It did not appear on Hevelius' atlas of 1687 or Johann Bode's Uranographia atlas of 1801 and was quickly forgotten.