American River
The North Fork is the longest tributary of the American River, at . It begins at an elevation of about near Lake Tahoe in Placer County at Mountain Meadow Lake, just northeast of Granite Chief and immediately due west of Squaw Valley Ski Resort. It flows westward through remote wilderness areas.
Mississippi River System
The Arkansas River is one of the major tributaries in the Mississippi River system. It flows west to east starting in Colorado and dumping the Mississippi River. Its length of 1,469 miles allows it to flow through Colorado, Kansas, Oklahoma, and Arkansas. It is the sixth longest river in the US, the second longest tributary to the Mississippi River System, and the 45th longest river in the world.