How we cite our quotes: (Line)
Quote #1
Unlifted was the clinking latch; (4)
The latch on the gate has not been lifted. Mariana has not left the grange in some time. Tennyson uses her surroundings, including nature, to let us know that she's secluded herself. The gate has not clinked open for anyone, and it hasn't let her out, either.
Quote #2
She drew her casement-curtain by,
And glanced athwart the glooming flats. (19-20)
Mariana, peering outside, sees only the "gloaming flats." This is the extent of her interaction with the outside world: through her bedroom windows. Nobody stops by, and nothing really happens. Maybe she should just get cable.
Quote #3
About a stone-cast from the wall
A sluice with blacken'd waters slept, (37-38)
The moat lies not far from the wall of her farmhouse. This means that she lives in a pretty enclosed space. In the moat, the water "sleeps" as if it has been undisturbed. Nobody has crossed the waters in some time, so they slumber and turn dark and murky. Tennyson's imagery here plays into the pathetic fallacy that repeats throughout the poem. Nature is described as acting and feeling like Mariana—and Mariana feels trapped, desolate, and sleepy.