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In page Stalactite:

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The White Chamber in the Jeita Grotto's upper cavern in Lebanon contains an 8.2 m (27 ft) limestone stalactite which is accessible to visitors and is claimed to be the longest stalactite in the world.[citation needed] Another such claim is made for a 20 m (66 ft) limestone stalactite that hangs in the Chamber of Rarities in the Gruta Rei do Mato (Sete Lagoas, Minas Gerais, Brazil).[citation needed] However, cavers have often encountered longer stalactites during their explorations. One of the longest stalactites viewable by the general public is in Pol an Ionain (Doolin Cave), County Clare, Ireland, in a karst region known as The Burren; what makes it more impressive is the fact that the stalactite is held on by a section of calcite less than 0.3 m2 (3.2 sq ft).[1]