First, name one of the following major rivers: Arkansas, Colorado (the one beginning in CO, not TX) , Columbia, Hudson, Mississippi, Missouri, Ohio, Rio Grande or Snake by simply entering it. Then, name the cities along that river – a city is along the river if its US Census boundary intersects with the river. 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.