The Lucs peat bog is located 10 km west of Sâncrăieni, in the northern part of the Southern Harghita mountain range, in the immediate vicinity of the main ridge, between the Tolvajos roof and the Stinky Bath of Szentimre, in a giant crater (caldera).
Its area is 120 hectares, but the area around it has been protected since 1955, so the total protected area is 273 hectares. The peat bog in the aged, marshy funnel of the Nagykőbükke volcanic crater, the peat layer 4-5 meters thick, was estimated at a total of about 3 million cubic meters. Its surface is covered with a thick layer of moss, including the ice-age numbered Tundra birch (Betula nana), peat rosemary, round-leaved dew grass, cranberry, but most of the forest spruce is found in the area, which the locals call spruce, the protected area Lucs, and its surroundings Lucs tributary. Lucs is drained to the west by the Kormos stream and to the east by the Nagyos stream.
The caldera at an altitude of 1080 m is approximately 7 km in diameter. It is the largest peat bog in Romania. Here you can find the tiny birch of the Ice Age Tundra, as well as a number of plant rarities: peat rosemary, round-leaved dewgrass, cranberries, woollen silk, various mosses and birches. The dwarf pine (spruce), which grows sparsely among the peat mosses of the moor, makes the moor similar to the image of the northern tundras. Hiking is not advisable without a guide, because the vegetation of the moor is so monotonous and uniform that it is almost impossible to navigate in it. The reptile species typical of the moor are the live-bearing lizard and the crusader. Its large wild population is typical of the surrounding forests, where brown bears, red deer, wild boar, deer, wolves and lynx are common.
Today it is also a Natura 2000 site for the protection of habitats (ROSCI0246).
