Neptune's grotto
Neptune's Grotto (in catalan Coves de Neptú), have a total length of approximately 4 km
(but it is possible to visit only about 100 meters).
These coves have a karstic origin.
They are situated about 24 km away from Alghero in the North West side from the Capo Caccia promontory.
Inside of these eroded coves it is possible to admire the La Marmora pond (120 meters length), many stalactite and stalagmite columns and a small beach which once was the monk seals destination.
These marine caves can be reached by two different methods: the first one crossing the Escala del Cabirol (in catalan "goat’s steps").
The 654 steps staircase were built on the cliffs that, with a difference of level of 100 metres leads to the entrance of the cave.
Other possibility is through the sea, with departure from Alghero port or from Porto Conte boarding, in the Cala Dragunara bay jetty.
This second option depends of sea conditions which are often rough because of northwest winds that sweep the coast. This second possibility is particularly recommended for those who want to visit part of the coast.
The ferry service is available all the days in spring and summer and it is less frequently in autumn and winter.
Calich bond and Roman Bridge
The Calich pond has an elongate shape and it is located in parallel with the coast. Its total surface is about 100 hectares and its depth changes every season in relation with freshwater influx. Many non-migratory and migratory species nest here. It is possible to admire the pink flamingo. The watertight is assigned for mussels, crabs, basses and gilt-head beams farming.
It is prohibited the sport fishing in the common farming zones.
On the pond it is possible to admire the rests of a roman bridge once used to cross the section confluence between the pond and the sea. Originally the bridge was developed on 24 arches, 10 of them (almost the half of the bridge) were destroyed in 1930 during the bridgework improvement.