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Official X account of UNESCO.
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February 2009
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Today marks the first-ever International Day of Caves and Karst!
Did you know that over a billion people live on karst? These landscapes, where rain vanishes into the rock and resurfaces kilometres away, supply drinking water to much of the world.
๐ต๐น See what they look like in Portugal's Algarvensis @UNESCO Global Geopark:
#UNESCOGeoparks#
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