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

UNESCO

@UNESCO

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.

Joined February 2009

2.4K Following 5.5M Followers

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#