Skalnaté pleso is a glacial lake and a well-known goal for many locals and tourists that head to the High Tatras. You can reach it by cable car or by foot. It's also a starting point for other hiking trails in the surrounding area. You can have some food and coffee in its area or check out the observatory nearby.
Wikipedia (Slovak) https://sk.wikipedia.org/wiki/Skalnat%25C3%25A9_pleso
More Information https://www.vt.sk/vylety-lanovkami/skalnate-pleso/
Address 05960, Slovakia
Coordinates 49°11'18.99" N 20°13'55.587" E