Blue Grotto

The Blue Grotto refers to a number of sea caverns on the south east coast of Malta, a short distance from the fishing harbour limits of Wied iż-Żurrieq, Malta. Wied iz-Zurrieq, the blue grotto and neighboring caves, are all located within the Qrendi village confines, per Local Council Act 1993 and a 1910 legal dispute between the villages of Qrendi and Zurrieq over their jurisdiction, which ruled in favour of Qrendi.Both the Wied iz-Zurrieq harbour and Blue Grotto sea caves are located on the coastline opposite to the small uninhabited islet of Filfla, which is a bird sanctuary.

The location of the caves lead to the seawater reflecting shades of blue on the cave walls and ceilings.

Source: Wikipedia