You can also reach it on foot along a path that crosses the promontory overlooked by a Spanish tower and covered with Mediterranean vegetation, at the foot of which you will see the ruins of the Phoenician city of Bithia (8th century BC). The beach of sa Colonia is one of the 'prized pieces' of the long coast of Chia, in the territory of Domus de Maria: a large expanse of soft white-amber sand plunging into a crystalline and emerald-coloured sea, with seabeds that slope gently towards the open sea. The beach is made even more particular by the islet of Cardolinu, joined to the beach by a narrow sandy isthmus.