The River Stort is a river in Essex and Hertfordshire, England. It is 24 miles (39 km) long and flows from near the village of Langley to the River Lea at Hoddesdon.
The river's name is a back-formation from the name of the town of Bishop's Stortford. The 16th-century cartographers Christopher Saxton and William Camden named it the Stort, assuming the town of Stortford was named for its ford. The river was originally called the Stour.
The River Lea (/ˈliː/ LEE) is in the East of England and Greater London. It originates in Bedfordshire, in the Chiltern Hills, and flows southeast through Hertfordshire, along the Essex border and into Greater London, to meet the River Thames at Bow Creek. It is one of the largest rivers in London and the easternmost major tributary of the Thames.
The river's significance as a major east–west barrier and boundary has tended to obscure its importance as a north–south trade route. Below Hertford the river has since medieval times had alterations made to make it more navigable for boats between the Thames and eastern Hertfordshire and Essex, known as the Lee Navigation. This stimulated much industry along its banks. The navigable River Stort, the main tributary, joins it at Hoddesdon.