Alghero has a varied natural landscape, from sandy beaches to rocky cliffs with flat or very jagged:is especially appreciated the view from the sea, as it manages to capture the diversity of its coast mixed vegetation, the typical Mediterranean Scrub and the pine forest, which often acts as a contour;much appreciated for its landscape is the promontory of Capo Caccia, with his now famous cliff in the shape of a sleeping giant that has become a symbol of Alghero, along with the precious red coral.

The area of Capo Caccia with the nearby Isola Piana and the Gulf of Porto Conte is a site of primary natural interest, which was recently formed the Natural marine protected area “Capo Caccia-Isola Piana”.The particular geological (karst origin) makes the area rich in caves and gorges, still largely unexplored.Stress here the famous Grotte di Nettuno (Caves of Poseidon), accessible by sea or from land (by the famous Escala del Cabirol, of 656 steps), and that it has got a range of halls and pools, like the Piscina del Gigante (Pool of the giant), and stalactites and stalagmites of forms, such as the organ.

On the eastern side of Capo Caccia is open to the sea the Grotta dei Ricami (Cave of Embroidery) and the Grotta Verde (Green Cave), accessible only by sea; in the first several concretions gave rise to the embroidery of limestone, now it is completely devastated and concretions are scattered everywhere, and the second one can still see the remains of some graffiti dating from the Palaeolithic, almost lost through vandalism and past attempts to "tear".

Another protected area where you can make trekking is the “Ark of Noah”, which is located not far from the hamlet of Tramariglio: still nest here on the edge of cliffs, the Gryphon, and other protected birds such as peregrine falcon, the kestrel, The Cormorant (who prefers the Island overlooking Foradada) and Seagull but you can also see examples of Pernice, Deer, Cavallino della Giara (Little horse of the Giara) and Wild Boar and, in addition to several protected plant species such as Centaurea horrida. The area is vast and includes Monte Timidone (Shy mountain), Punta Cristallo (Crystal peak), where it is possible to admire the flight of griffins and the beautiful Cala d'Inferno (Hell’s Cove), where the crystal clear sea allowed to do some snorkeling.

Other recommended points for snorkeling are Cala Dragunara, Punta Giglio, the two caves Foradada and the island of Porto Conte, the largest natural harbor in the Mediterranean, where Nacchera (Pinna nobilis), protected for years against abusive fishing, is finally seen with multiple copies. The Grotta dei Cervi (Cave of Deers) also offers opportunities for lovers of diving with several kilometers of limestone cliffs overlooking the sea and its countless caves, environments of the most spectacular in the Mediterranean offering an incredible variety of marine fauna and flora. Already a few meters deep are viewable considerable colonies of red coral, the symbol of the city of Alghero, all types of shellfish such as lobster, huge lobsters and grasshoppers, and moray eels, huge congers and multiple copies of grouper brunette.

The most famous site is the Grotta di Nereo (Cave of Nereus), considered the largest sea cave in Europe, with depths ranging from -30 to -6 m or so, but less known is the Grotta di Falco (Cave of Hawk) and Punta Giglio, renamed "Of Deers" to the incredible discovery made in'95 by Busdraghi, a famous local sub, a deposit of fossil deers type Megacero Cazioti Algarensis dating back about 100,000 years, now extinguished, the Cave of Ghosts, the latest discovery by the same which has appointed for the particular shape of the rocks, and then the Caves of the Submarine, the Madonnina (Madonna) and the Portico di Punta Salinetto.

For diving in the cave you must have permission of AMP but not for more security we recommend, however, rely on qualified dive centers distributed in the territory. Near the hamlet of Fertilia, there is the pond of brackish water of the Calich, with the ruins of the Roman bridge, where once you could see pink flamingos during the period of migration, for those who love bite within a reference point is the Lake Baratz (unique freshwater lake nature of Sardinia) with the pine forest surrounding the lake, and in which during the retreat in the German army surrounded weapons and ammunition.