The Inland Sea, sometimes called Qawra in Maltese and also known as Dwejra, is a lagoon of seawater on the island of Gozo linked to the Mediterranean Sea through an opening formed by a narrow natural arch.

[1][2] It was probably formed where a geological fault in the limestone had created a sea cave and the roof then collapsed.

Exiting through the tunnel towards open sea, the floor drops away in a series of shelves to a depth of up to 35 meters on the outside.

It is reported that Jacques Cousteau said the Inland Sea was among his top ten dives.

[4] On calm days fishing boats, known in Maltese as luzzijiet, can pass through the tunnel.