Gemma Hardy p. 309 

Hannah speaks about this site to Jean (Gemma) when she is convalescing in their cottage. She tells Jean they will walk up there when she feels better. The Falls of Moness were a series of waterfalls on the Moness Burn in the Birks of Aberfeldy (Birches of Aberfeldy), which was also made famous in a poem/song by Scottish poet Robert Burns.‘The Birks of Aberfeldy" is the song lyric written for a pre-existing melody in 1787 by Robert Burns. He was inspired to write it by the Falls of Moness and the birch trees of Aberfeldy during a tour of the Scottish Highlands with his friend William Nicol.

  https://www.world-of-waterfalls.com/waterfalls/europe-falls-of-moness/