Sentence:  Nothing could be more business-like than the construction of the stout dams, and nothing more gently rural than the limpid lakes, with the grand old forest trees marshalled round their <WSD>margins</WSD> like a veteran army that had marched down to drink, only to be stricken motionless at the water's edge. 
Meaning of the word marked with <WSD> tags:  The edge or border of any flat surface.