The River Lea is a river in England that flows through the counties of Hertfordshire and Essex. It is approximately 44 miles long and is known for its scenic beauty and wildlife. The river eventually joins the River Thames at Bow Creek in East London, making it an important waterway in the region. Historically, the River Lea has played a significant role in trade and industry, particularly during the Industrial Revolution. It is also associated with the Lee Navigation, a man-made waterway that allows for navigation and transport. The river is popular for recreational activities such as walking, cycling, and boating.