depth of , one of the deepest worldwide, was first discovered in 1965 by British speleologists of the Cambridge University Caving Club, and has since then been surveyed by a large number of expeditions. The nearby Chasm of Epos, with a depth of , drains the water coming from the surrounding plateaus. Mt Tymphe represents a series of uplifted fault blocks and faulted escarpments and is largely composed of Palaeocene-Eocene limestone, with some exposures of Campanian-Jurassic dolomite and limestone on the northern scarp. The lower slopes are dominated by younger flysch rocks, which consist of thin beds of graded sandstones intercalated with softer, fissile siltstones. Extended glacial conditions prevailed on the uplands of Mt Tymphe during the Late Quaternary period, ca. 28,000 years ago. The glacial landscape is well-developed, especially on the southern slopes of Mt Tymphe, across the Astraka-Gamila plateau, and in the upland terrain above the villages of Skamneli and Tsepelovo, where lateral and terminal moraines form major landscape features. Additional forms of glacial deposits, which extend down to above sea level, include rock glaciers and limestone pavements. Settlements There are four villages inside the Vikos–Aoös National Park, and an additional nine near the borders of the peripheral zone. All of these settlements, in the western part of the Zagori region, are sparsely populated with a total population of 1,515 people. The villages have a nucleus-like form, with the houses situated around the central square and interconnected by pathways paved by slate or cobblestone. Historically, all the villages of the Zagori region were connected by a system of paths or small roads and they functioned more like a single entity rather than as separate communities. The economic affluence of Zagori's past is still reflected in the architecture of the villages, while today the preservation of the local architectural legacy is enshrined in a law which dictates that all buildings in the area must be constructed with local traditional materials and in compliance with local architecture. One of the characteristic features of the National Park is its stone bridges, which were the only connection to the outside world until roads were built in the 1950s. Sixteen of these stone bridges and seven churches in the region have been listed as protected historical monuments. Climate The climate of the Vikos–Aoös National Park is Mediterranean, transitioning to continental. The Mediterranean character is characterized by the annual distribution of precipitation, high in