The Long Distance Walkers Association (LDWA) is a British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 association whose aim is "to further the common interests of those who enjoy Long Distance Walking". It was established in 1972 and has over 6,000 members. It defines a "long distance walk" as "any walk over 20 miles".
The association has 42 local groups which organise walks for their members, and publishes a journal Strider three times a year. Walks fall into two categories. Group walks (also referred to as social walks) are normally led walks of up to 20 miles in length. Challenge events are normally between 20 and 100 miles, are self led (i.e. participants navigate the route based on written instructions) and must generally be completed within a defined time limit . Challenge walks are marshalled i.e. participants must call in at clipper points or checkpoints to get a tally card punched to show they are following the route. Information about group walks, challenge events (including ones arranged by other organisations who agree to the association's conditions for challenge walks) and other information of interest to walkers such as a database of long distance paths in the UK can be found via the association's web site.

The LDWA's annual "Hundred" event, entailing walking 100 miles in 48 hours, takes place each Spring Bank Holiday weekend.

The Association, along with the Ramblers Association, is recognised by Sport England

Sport England

Sport England is the brand name for the English Sports Council and is a non-departmental public body under the Department for Culture, Media and Sport...

 as the governing body

Sport governing body

A sport governing body is a sports organization that has a regulatory or sanctioning function. Sport governing bodies come in various forms, and have a variety of regulatory functions. Examples of this can include disciplinary action for rule infractions and deciding on rule changes in the sport...

for "Rambling" in England.