Arenzano and Cogoleto extend along the coast between Cape Invrea and the cliffs of the Lastroni, where there is a characteristic rock called "Aguggia" which has given the name to the area. The natural boundary between the two territories is Cape San Martino, beyond which there is the small valley of the stream Lerone. The high grounds sheer to the sea, have been exploited as lime quarries at Cogoleto and as copper and stone quarries at Arenzano.
The villa Pallavicini-Negrotto-Cambiaso is located in the municipal Park, and looks like a fortress.