UNESCO(@UNESCO):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. 🇵🇹 See what they look like in Portugal's Algarvensis @UNESCO Global Geopark: https://t.co/hR1xw5jfXS #UNESCOGeoparks

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Building peace where it starts - in the minds of women & men. Official X account of UNESCO. Follow our Director-General: Khaled El-Enany @UNESCO_DG.

参加 February 2009

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UNESCO@UNESCO

2026.09.13 13:00

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. 🇵🇹 See what they look like in Portugal's Algarvensis @UNESCO Global Geopark: #UNESCOGeoparks#