Zanzibar, turquoise water

Have you ever seen water so clear? What colour is this water? Aquamarine? Turquoise? Sea Blue?

This is in Zanzibar, an island which is part of Tanzania.

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• Zanzibar Is an Acrchipelago Made Up of Zanzibar and Pemba Islands and Several Islets. (swahilisafari.wordpress.com)