Jezerní slať (Lake moor) is a 103,5-hectare peat bog located between settlements Kvilda and Horská Kvilda, as a part of the Šumava National Park, at an altitude of 1057-1075 meters. It reaches a depth of 7,6 meters. A part of the moor was dewatered and mined in the 19th and 20th century. The mining was finished in 1933 and a reserve has been declared. 

There is a nature trail leading to the entrance of the area and also a 7-meters high lookout that offers spectacular views at the whole peat bog. The trail is intended only for walking, the entrance for cyclists is forbidden.

This moor is one of the coldest places in the Czech Republic. You can find a lot of rare plants and animals there, such as stunted birch (only 50 cm high), mountain pine, adder, black grouse, viviparous lizard.

Jezerní slať is an extensive peat bog and natural landmark situated in the Prachatice district in Šumava and is part of Šumava National Park. Located between settlements Kvilda and Horská Kvilda, the average depth of the peat is around 2,5 meters. The reservation extends in the elevation from 1057 to 1075 meters. Being the fourth biggest bog in Šumava, the expanse of the area is about 208 hectares. There is a nature trail leading to the entrance of the area and also a 7-meters high lookout that offers spectacular views at the whole peat bog. The trail is intended only for walking, the entrance for cyclists is forbidden.