Xemxija (Maltese: Ix-Xemxija, pronounced shem-shee-ya) is a suburb in the western part of St. Paul's Bay in the Northern Region, Malta.

[5] In around 1715, the Order of St. John built Arrias Battery as part of a series of fortifications defending Malta's coastline.

The conservation of water was needed for the British military and their horses, who surveilled the area from the nearby defence posts.

[7][8] An underground emergency flour mill was built in Xemxija during the Cold War.

It has been restored to working condition by the Fondazzjoni Wirt Industrijali Malti (Maltese Industrial Heritage Foundation), and is now open to the public.