The River Aln is a river located in Northumberland, England. It flows for approximately 20 miles, starting in the Cheviot Hills and emptying into the North Sea at Alnmouth. The river is known for its scenic beauty and diverse wildlife, making it a popular spot for nature enthusiasts. The surrounding area of the River Aln includes the historic town of Alnwick, famous for its castle and gardens. The river also supports various recreational activities, such as fishing and walking along its banks, providing a tranquil environment for visitors and locals alike.