First, name one of the following 8 major rivers: Arkansas, Colorado, Columbia, Mississippi, Missouri, Ohio, Rio Grande or Snake by simply entering it. Then, name the cities of 1K+ population which are on that river. I counted a city as on the river if it was within the following distance for each city size range: 1-25K: 2.5 miles, 25-100K: 5 miles, 100-500K: 10 miles, 500K+: 15 miles. Cities are sorted along by coordinates which are either E-W or N-S depending on the direction of the river – they may not all be exactly in order along the river’s path, they are ordered by latitude or longitude.