Tarn

There's a small mountain tarn, surrounded by alpine meadows.

Source: tatoeba (11639702)

Thou Wind, that ravest without, / Bare craig, or mountain-tairn, or blasted tree, / Or pine-grove whither woodman never clomb, / Or lonely house, long held the witches' home, / Methinks were fitter instruments for thee, / Mad Lutanist! [footnote: Tairn is a small lake, generally if not always applied to the lakes up in the mountains, and which are the feeders of those in the valleys.[…]]

Source: wiktionary

It was possible, I reflected, that a mere different arrangement of the particulars of the scene [of the House of Usher], of the details of the picture, would be sufficient to modify, or perhaps to annihilate its capacity for sorrowful impression; and, acting upon this idea, I reined my horse to the precipitous brink of a black and lurid tarn that lay in unruffled lustre by the dwelling, and gazed down—but with a shudder even more thrilling than before—upon the re-modelled and inverted images of the gray sedge, and the ghastly tree-stems, and the vacant and eye-like windows.

Source: wiktionary

Tarns are found in some of the vales, and are numerous upon the mountains. A Tarn, in a Vale, implies, for the most part, that the bed of the vale is not happily formed; that the water of the brooks can neither wholly escape, nor diffuse itself over a large area. Accordingly, in such situtions, Tarns are often surrounded by an unsightly tract of boggy ground; but this is not always the case, […]

Source: wiktionary