Locks in England are devices used to control the flow of water in canals and rivers. They allow boats to navigate changes in water levels by raising or lowering them between sections of water. The first modern lock was built in the early 17th century, and they became essential for trade and transportation during the Industrial Revolution. The Grand Union Canal and the Kennet and Avon Canal are two notable waterways featuring numerous locks. These structures not only facilitate boating but also contribute to the scenic beauty of the English countryside, attracting tourists and nature enthusiasts alike.