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 2689?

Name: International Day of Caves and Karst
Start: 2689-09-13
End: 2689-09-13
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 2689?: International Day of Caves and Karst 2689 is on Friday, 13 September 2689.
What day of the week is International Day of Caves and Karst 2689?: It falls on Friday.
How is International Day of Caves and Karst calculated?: This event is observed every year on 13 September.