What is a major river in Oklahoma?
If you are asking about the borderline between Texas and Oklahoma it is called the red river. So technically it's in Oklahoma AND Texas.
There are two major rivers through which water flows out of Oklahoma: 1. The Red River which forms the border between Oklahoma and Texas, and 2. The Arkansas River which is sometimes divided into two major river basins within Oklahoma; the Canadian and the Arkansas. Technically there are also two small rivers that also exit Oklahoma: the Poteau and the Little Rivers, but both join the other major rivers soon after entering Arkansas (the Poteau…
Some of the larger tributaries include the Canadian River, in southern Oklahoma, the Neosho River (also known as the Grand River), in eastern Oklahoma, the Cimarron River, in mid-Oklahoma. Through Kansas and Colorado, the Arkansas River receives much smaller rivers as tributaries. The headwaters are in the Rocky Mountains near Leadville, Colorado.
There is no such thing as a "popular river" in Oklahoma, or any other US states for that matter. However, I can tell you that the river in Oklahoma that has the largest width, length, height and size is the "Arkansas River", which runs through the City of Tulsa, Oklahoma --- which is located in the Northeast-Central section of the US State of Oklahoma (nicknamed "The Sooner State).