What mood do you get from this description???

Like most shortcuts, it was ill-chosen route. The swamp was thickly grown with great gloomy pines and hemlocks, some of them ninety feet high, which made it dark a noonday, and a retreat for all the owls of the neighborhood. It was full of pits and quagmires, partly covered with weeds and mosses, where the green surface often betrayed the traveler into a gulf of black, smothering mud; there were also dark and stagnant pools, the abodes of the tadpole, the bullfog, and the water snake; where the trunks of pines and hemlocks lay half-drowned, half-rotting looking like alligators sleeping in the mire.