Millhead Stream

The Lea Valley, the valley of the River Lea, has been used as a transport corridor, a source of sand and gravel, an industrial area, a water supply for London, and a recreational area. The London 2012 Summer Olympics were based in Stratford, in the Lower Lea Valley. It is important for London's water supply, as the source of the water transported by the New River aqueduct, but also as the location for the Lee Valley Reservoir Chain, stretching from Enfield through Tottenham and Walthamstow.

The Royal Gunpowder Mills are a former industrial site in Waltham Abbey, England. It was one of three Royal Gunpowder Mills in the United Kingdom (the others being at Ballincollig and Faversham). Waltham Abbey is the only site to have survived virtually intact. The Royal Gunpowder Mills, Waltham Abbey, were in operation for over 300 years. Starting in the mid-1850s the site became involved in the development of revolutionary nitro-based explosives and propellants known as "smokeless powder". The site grew in size, and black powder became less important. Shortly after the Second World War it became solely a Defence Research Establishment – firstly the Explosives Research and Development Establishment, then the Propellants, Explosives and Rocket Motor Establishment Waltham Abbey; and finally the Royal Armament Research and Development Establishment Waltham Abbey. The Mills are an Anchor Point of the European Route of Industrial Heritage, set in 175 acres (0.71 km2) of parkland and containing 21 buildings of major historical importance.

Waltham Town Lock (No 11) is a lock on the River Lee Navigation at Waltham Cross, Hertfordshire. The lock is located in the River Lee Country Park which is part of the Lee Valley Park. The adjoining Showground site now known as the Broxbourne White Water Canoe Centre has been chosen to host the canoeing event in the 2012 Summer Olympics.Flowing close to the lock is the River Lee Flood Relief Channel known as the Horsemill Stream at this point.

Waltham Abbey Town Hall is a municipal facility on Highbridge Street in Waltham Abbey, Essex. It is a locally listed building.

The Cornmill Stream and Old River Lea is a 24.6-hectare (61-acre) biological Site of Special Scientific Interest in Waltham Abbey, Essex.

The Abbey Church of Waltham Holy Cross and St Lawrence, also known as Waltham Abbey, is the parish church of the town of Waltham Abbey, Essex, England. It has been a place of worship since the 7th century. The present building dates mainly from the early 12th century and is an example of Norman architecture. To the east of the existing church are traces of an enormous eastward enlargement of the building, begun following the re-foundation of the abbey in 1177. In the Late Middle Ages, Waltham was one of the largest church buildings in England and a major site of pilgrimage; in 1540 it was the last religious community to be closed during the Dissolution of the Monasteries. It is still an active parish church for the town.The monastic buildings and those parts of the church east of the crossing were demolished at the Dissolution, and the Norman crossing tower and transepts collapsed in 1553. The present-day church consists of the nave of the Norman abbey church, the 14th-century lady chapel and west wall, and a 16th-century west tower, added after the dissolution.King Harold Godwinson, who died at the Battle of Hastings in 1066, is said to be buried in the present churchyard.

Canoeing at the 2012 Summer Olympics in London were contested in two main disciplines: canoe slalom, from 29 July to 2 August, and canoe sprint, from 6 to 11 August. The slalom competition was held at the Lee Valley White Water Centre and the sprint events were staged at Eton College Rowing Centre, at Dorney Lake, known as Eton Dorney. Around 330 athletes took part in 16 events. The men's 500m sprints were replaced by a 200m race; in addition, the men's C-2 500m was replaced by a women's K-1 200m sprint. This was confirmed at an International Canoe Federation board meeting at Windsor, Berkshire, on 5 December 2009. For the first time, women competed in two individual events in sprint canoeing. Because of the changes, the finals were spread over a three-day period instead of the traditional two days which had been in effect since the 1976 Games. The most successful nation in the slalom was France, with two gold medals in the four events, followed by Great Britain with one gold and one silver. In the sprint, Hungary was the most successful with three gold, two silver and one bronze medal, while Germany topped the medal table overall, with three gold, two silver and three bronze medals.

Lee Valley White Water Centre (previously known as Broxbourne White Water Canoe Centre) is a white-water slalom centre, that was constructed to host the canoe slalom events of the London 2012 Olympic Games. On 9 December 2010, Anne, Princess Royal officially opened the venue which is owned and managed by Lee Valley Regional Park Authority. The £31 million ($50 million US) project to construct the centre finished on schedule and was the first newly constructed Olympic venue to be completed. The Olympic canoe slalom competition was held from 29 July through 2 August. The venue also hosted the 2015 ICF Canoe Slalom World Championships.

The Cornmill Stream is a minor tributary of the River Lea in the English county of Essex.

Waltham Abbey SSSI is a 34.2-hectare (85-acre) biological Site of Special Scientific Interest which is located within the Waltham Abbey Royal Gunpowder Mills at Waltham Abbey in Essex.

The Lee Flood Relief Channel (FRC) is located in the Lea Valley and flows between Ware, Hertfordshire, and Stratford, east London. Work started on the channel in 1947 following major flooding and it was fully operational by 1976. The channel incorporates existing watercourses, lakes, and new channels. Water from the channel feeds the Lee Valley Reservoir Chain.

The Small River Lea is a minor tributary of the River Lea, which flows through the Lee Valley Park between Cheshunt and Enfield Lock. It forms part of the Turnford and Cheshunt Pits Site of Special Scientific Interest (SSSI) as it flows through the River Lee Country Park.