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        • Empower communities to look after their local rivers:

          We mobilise thousands of volunteers every year, working along the riverbank to transform neglected rivers into areas that everyone can use and enjoy.

        • Restore the capital’s network of rivers through the power of nature

          We work to clean and green the capital’s 400-mile network of rivers through innovative solutions to boost biodiversity and restore nature.

        • Build a climate resilient London

          We help to build more engaged communities and healthier rivers better able to adapt to the impacts of climate change, now and into the future.

        • Empower communities to look after their local rivers
          We mobilise thousands of volunteers every year, working along the riverbank to transform neglected rivers into areas that everyone can use and enjoy.

        • Restore the capital’s network of rivers through the power of nature
          We work to clean and green the capital’s 400-mile network of rivers through innovative solutions to boost biodiversity and restore nature.

        • Build a climate resilient London
          We help to build more engaged communities and healthier rivers better able to adapt to the impacts of climate change, now and into the future.

        • Improving Rivers
          • Backwater restoration in the Maidenhead to Teddington catchment
          • Bathing waters – Reclaim Our Rivers
          • Cator Park, London Borough of Bromley
          • Understanding our rivers through connecting communities to waterways – Catchment Partnerships
          • Chinbrook Meadows Wetlands
          • Community Action for the Cut
          • Greenwich Natural Flood Management (NFM) Project
          • Marsh Dykes & Thamesmead Catchment Improvement Project
          • Oxford Rivers Project
          • Quaggy Habitats – Capel Manor Project
          • Queensmead Recreation Ground, London Borough of Bromley
          • Rewilding the Rom
          • River Beck Restoration
          • River Biodiversity Net Gain Units
          • Road run-off
          • South Essex Catchment Partnership
          • The River Ravensbourne and Glassmill Pond
        • Connecting Communities
          • Beckenham Place Park East – River Ravensbourne
          • Become a Citizen Scientist
          • Chestnuts Field
          • EMPOWER Rivers
          • Plasticblitz
          • Action for Silk Stream
          • Thames Connections
          • Thames River Watch
          • The Roding Rises
        • Education and Training
          • Citizen Science
            • Leading Action for Healthy Rivers: Thames21’s flagship training course
            • Welsh Harp Environmental Education Centre
        • What we do
  • News
  • London Rivers Week
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        • Corporate Team Days
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        • London Rivers Week 2026 Photography Competition
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East London’s rivers choked by our waste – report reveals

A study of rivers running through the London Boroughs of Hackney, Haringey, Tower Hamlets, and Waltham Forest and Epping Forest has shown that the Lea…

Published 16th December 201128th February 2022 Published in Latest news, Love the Lea

Tree Planting with Mitchellbrook Primary School

Mitchell Brook Primary School students are working with Thames21 to improve Brent Feeder Canal for people and wildlife. Students from reception classes and after school…

Published 12th December 201128th February 2022 Published in Brent, Latest news

Photography competition winner announced

Jenny Dowsett was announced as the winner of the first Thames21 Hillingdon waterway photography competition at the launch of the project late last month. (see…

Published 12th December 201128th February 2022 Published in Hillingdon, Latest news
River Lea water testing

River Lea water testing

We’ve now finished analysing the water samples taken on the main tributaries of the Lea – Salmons Brook, Pymmes Brook, the Moselle, Dagenham Brook, Cobbins…

Published 8th December 201130th April 2013 Published in Latest news, Love the Lea
Fatwalk receives planning permission!

Fatwalk receives planning permission!

The new two-mile long route – one of the Mayor’sGreat Spaces projects – will include new footpaths and cycle ways set within new structures aimed…

Published 5th July 201130th April 2013 Published in Lea River Park
Three Mills Green re-design progressing

Three Mills Green re-design progressing

Churchman Landscape Architects have been appointed by the Lee Valley Regional Park to improve Three Mills Green for people and wildlife. They will be holding a…

Published 26th April 201130th April 2013 Published in Lea River Park
Lea River Park submitted for planning permission!

Lea River Park submitted for planning permission!

The plans for the Lea River Park have been submitted to Newham and Tower Hamlets councils to be assessed for planning permission.  See the ‘Fatwalk’…

Published 6th April 201130th April 2013 Published in Lea River Park

Latest News

  • London Rivers Week 2026 Photography Competition
    To mark London Rivers Week 2026, Thames21 is launching a photography competition celebrating the vital role that rivers play in the life of our city. The competition aims to highlight the beauty, diversity, and importance of London’s waterways, as well as the people...

Events Diary

Upcoming Events

Apr 30
11:00 am - 3:00 pm

Action for Silk Stream – River Action Day

Montrose Playing Fields
May 1
8:15 am - 9:15 pm

Action for Silk Stream – Bat Walk

Lyndhurst Park
May 23
10:00 am - 2:00 pm

London Rivers Week 2026: River Beck

Harvington Wood
View Calendar

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Thames21
THAMES21

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Main Office location (& deliveries)

The City of London,
Guildhall,
Aldermanbury Street,
LONDON EC2V 7HH

Postal Address

The City of London,
Guildhall,
PO Box 270,
LONDON EC2P 2EJ

Contact us

Satellite Office

Satellite Office: 

The Lock Office,
Bow Locks,
Navigation Road (off Gillender Street),
LONDON E3 3JY

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Registered Charity number: 1103997

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