Green Flag Trails work towards sustainable trail development, where the trails accredited meet strict criteria. Green Flag recognizes trails that meet minimum standards in terms of reliable information on:

accommodation (either luxury (work sheet) or standard (work sheet)
trail facilities and services rendered (work sheet)
difficulty level
type of environment the trail runs through (work sheet)
 proof of the conservation of natural and cultural resources and
assurance of hikers’ safety (work sheet)

Green Mountain. Image by A. Boguslawska: CC