[alistoriv]

"The term 'glen,' a Gaelic word that means 'narrow valley,' is not specifically included in that protection."

Well, the Scottish Gaelic word is actually gleann, and glen in Manx (a Gaelic language) actually means clean. Glen is an English borrowing of a generally Celtic word (compare Welsh glyn and Cornish glynn; both Brythonic languages, not Gaelic). In fact, the only modern Celtic language where the word is spelled glen is Breton, which is spoken in France.