The Inland Waterways Association is a membership charity that works to protect and restore the country’s 6,500 miles of canals and rivers, campaigning for the use, maintenance and restoration of Britain’s inland waterways. Find out more about what IWA campaigns for. See also our current campaigns. IWA is a democratic organisation that campaigns locally and nationally on behalf of its members for all waterways users as well as actively supporting waterway restoration. Find out more. The presence of boats is what makes navigable waterways distinctive and attractive to a wide range of users. The Holiday hire boat industry has a proud past and a bright future, discover boating hoildays for families and couples in the UK.