The 17 National Manx Glens are the officially adopted glens situated throughout the Isle of Man. The island country is renowned for its natural beauty and its "pocket sized" scenic natural glens.
All of these glens are to be found in wooded, steep river cuttings but the Isle of Man has more than 120 glens (in Manx, Glion or Glan) a website 'Glenology at Great.Outdoors.com/ManxGlens is an ongoing study of Manx place names and places to ascertain exactly how many glens actually exist in this 33 ml x 12 ml island country.
The 17 National Glens are:
The site presently has some 115 names listed which will no doubt increase as research continues.
By no means all glens are wooded and Glen Crammag running northwards from the B10 road into Sulby Reservoir at Crammag gives evidence of this. To date, no name was found for the neighbour glen of Glen Crammag which runds from the well known Brandywell Corner down into Sulby Reservoir. This is also treeless.
The names of some well known glens are strangely not known to many Manx residents. So the glen where the world famous Fairy Bridge is located on the main A5 road to Isle of Man Airport and the island's south. This is Ballalonna Glen which is named after the closest farmhouse.

Elfin Glen, Ramsey Lhergy Frissel, Ramsey Dhoon Glen, nr Laxey Laxey Glen, Laxey Silverdale Glen, nr Ballasalla Colby Glen, Colby Ballaglass Glen, runs to Cornaa Beach Glen Maye (Patrick), South Peel & Patrick Glen Helen, StJohns-Michael Glen Mooar (Michael), Kirk Michael Glen Wyllin, Kirk Michael Tholt-y-Will Glen, Sulby Valley Molly Quirk's Glen, Onchan Port Soderick Glen, Braddan/Santon border Groudle Glen, nr Onchan The Purt, Ballaugh, Ballaugh Bishops Court Glen, between Kirk Michael and Ballagh