The landscape is consistently personified throughout the poem:
flat-knock snoring of high mountains
the murmuring bareness of marching turrets
This first phrase describes the landscape as lying down, and perhaps idle.
The second suggests it is waking, coming to life and beginning to move.
Later MacLean also portrays the landscape as energetic, notably when he refers to a:
surge-belt of hill-tops
In this poem, the landscape seems to have distinct character and moods of its own; this is achieved through MacLean’s consistent and varied use of personification.