How is International Day of Caves and Karst calculated?

This event is observed every year on 13 September.

When is International Day of Caves and Karst 2876?

Name: International Day of Caves and Karst
Start: 2876-09-13
End: 2876-09-13
Location: Worldwide

Promotes the study and protection of caves and karst landscapes, including their water resources and biodiversity.

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When is International Day of Caves and Karst 2876?: International Day of Caves and Karst 2876 is on Sunday, 13 September 2876.
What day of the week is International Day of Caves and Karst 2876?: It falls on Sunday.
How is International Day of Caves and Karst calculated?: This event is observed every year on 13 September.