boundary lines

See: confines
References in classic literature ?
These continents do not show such decided, clear, and regular boundary lines as South America, Africa, and the Indian peninsula.
Please, uncle, I'd like your advice about the boundary lines and the best place for the kitchen.
But once more it was the same boundary line overgrown with wormwood, once more the same wormwood desperately tossed by the wind and carrying unreasoning terror to his heart.
So the old Nome climbed the foothills and trudged along the wild mountain paths until he came to a big gully that encircled the Mountain of Phantastico and marked the boundary line of the dominion of the Phanfasms.
Every faculty and perception in her passed the boundary line between insensibility and consciousness, so to speak, at a leap.
The boundary line between the part that had been cleaned and the part that had not was traceable wherever the inscription left a blank space of marble--sharply traceable as a line that had been produced by artificial means.
As I approached the boundary line Woola ran anxiously before me, and thrust his body against my legs.
While in the German camp in the Pare Mountains, which lie just east of the boundary line between German and British East Africa, Tarzan had overheard enough to suggest that the British were getting the worst of the fighting in Africa.
One step beyond that boundary line which resembles the line dividing the living from the dead lies uncertainty, suffering, and death.
From thence we looked upon a vast sea which, towards the north, distinctly traced its boundary line upon the sky.
Neither was it rendered more favourable to sanity by Flora's dashing into a rapid analysis of Mr Flintwinch's cravat, and describing him, without the lightest boundary line of separation between his identity and Mrs Clennam's, as a rusty screw in gaiters.
Even in the surrounding country it was a foggy day, but there the fog was grey, whereas in London it was, at about the boundary line, dark yellow, and a little within it brown, and then browner, and then browner, until at the heart of the City-- which call Saint Mary Axe--it was rusty-black.