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.

On one side the beach is closed by the promontory of Torre Chia; on the other it is bordered by Monte Cogoni, which separates it from another jewel, the beach of su Portu. Nearby there are many services: beach and canoe equipment rental, campsites, bars, restaurants, convenient parking and accessibility services. Sa Colonia is also a favourite destination for surf lovers, exposed to strong winds, as well as underwater fishing and diving, thanks to the beauty of the seabed. Behind it, in addition to beautiful dunes, you can admire the Chia pool. You can combine a trip to the seaside with a dip in archaeology: among the ruins of Bithia you can admire the remains of a tophetot, a children's cemetery, from the road leading to the main city, Nora, and of the necropolis, where the temple of the god Bes was also located, whose statue is kept in the National Archaeological Museum of Cagliari.

Chia bay is one of the most beautiful and renowned tourist resorts in Sardinia: a corner of paradise seven kilometres long. Going from Torre Chia towards the west, you will come across the beaches of sa Tuerra, Porto Campana, de su Sali until you get to su Giudeu, the most beautiful of all, often chosen as the setting for TV commercials. Behind it is the Spartivento pool, a habitat of many rare species. At the far western end, in a sheltered inlet, is Cala Cipolla. From here you can climb to the Cape Spartivento lighthouse, from whose summit you can see the whole of the Sulcis coast.