While the term "glen" is sometimes used synonymously with "valley", a glen is really a particular type of valley which is commonly (although not exclusively) seen in the Scottish Highlands. Glens are characterized by gently concave slopes and are wider than ravines. In this drone video by contributor JagerScot, you'll get an aerial view of Glen Affric. It's located about a half-hour west of Loch Ness. Not as well known as Glen Coe, Glen Affric is often considered Scotland's most beautiful glen.