The Piano Grande is a large plateau, 4,000 ft above sea level in the central Italian Apennine mountains. The Piano is flanked by the Sibilline group of mountains (Italian Monti Sibillini), the highest of which is Monte Vettore at 8,123 ft (2,476m). The Piano is a karstic basin (see under karst) composed of porous limestone that holds underground reserves of water, and it supports an astonishing array of wild flowers in the spring and summer. Its single village, Castelluccio (Norcia), is perched on a high rock in the middle of plateau, and is famous for the small delicate lentils which are grown in the surrounding plain.
The Piano Grande may be approached by road over mountain passes from Norcia in Umbria, from Ascoli Piceno in the Marche or from Visso to the north in the Apennines. (Wiki)
Castelluccio (1.452 m) is a village in Umbria, in the Apennine Mountains of central Italy. Administratively, it is a frazione of the ca. 28 km distant town Norcia.
The village making it the highest settlement in the Apennines. It lies above the "Great Plain" (Piano Grande - 1270 m), next to the Monti Sibillini National Park.
Rain and meltwater accumulate on the surface of the plain, which is made of largely impermeable sediments. The greenish ditches drain the water towards openings called Ponors, which are part of the karstic underground drainage system. If the karst drainage is blocked for any reason, water backs up and turns the plain into a temporary lake.
The village dates from the 13th century or slightly earlier, but was also settled by the Romans.
The fields on the slopes below the village are cultivated; the town is known for its excellent lentils. In springtime the nature of the fields is in lavish color, with red poppies and yellow rapeseed. The plains grassland is ideal for sheep husbandry. There is a lot of ski- and trekking tourism. (Wiki)