Sentence:  So this was my future home, I thought!...Backed by towering hills, the but faintly discernible purple <WSD>line</WSD> of the French boundary off to the southwest, a sky of palest Gobelin flecked with fat, fleecy little clouds, it in truth looked a dear little city; the city of one's dreams. 
Meaning of the word marked with <WSD> tags:  A path through two or more points ("compare ‘segment'''); a continuous mark, including as made by a pen; any path, curved or straight.