Hadde ikkje Hardangerfjordbreen mot slutten av istida rykt fram over fjordbotnen, ville Halsnøy ikkje eksistert som éi øy, men som mange småøyar. Breen skuva framfor seg så mykje leire frå havbotnen at Brattåsen, Toftåsen, Landåsen og Svartaberg vart samla i eitt landområde.
Ølve has a special soil type. Here one finds an extra hard clay soil. This is especially noticed by those who work with excavating for building foundations and the like. Often it is necessary to use especially big digging machines and sometimes even dynamite in order to break up the compact masses. The reason for this is the growth of the glaciers toward the end of the Ice Age: The clay, that was first deposited in front of the glacier, came under great pressure when the glacier later grew and slid out over the clay.
Fjøsanger is known among ice age researchers from around the world. Under an excavation in 1975-77, geologists from the University of Bergen found layers from the last interglacial, ca. 115 000 to 130 000 years old.
Salhus has been a connecting point for sea travellers far back in time. The name probably derives from the Old Norse word sáluhús, “house for travellers”. The name may indicate that this was a place for an inn even in the Middle Ages. The place is eminently situated in the route to and from Bergen. For travellers coming by boat from Sogn and Nordhordland, Salhus is the last stop before Bergen. Travellers from the communities in Voss also came this way earlier when they were going to Bergen
Close to the tunnel opening at Amalie Skrams vei in Ssandviken, there is a cultural monument of European dimensions; a rope making works that produced rope and fishing tackle for West and North Norway.
Down by the fjord at Svåsand, close to the main highway, there is a long row of boathouses, one of the well-preserved, older boathouse locations along the Hardanger fjord. It is the farms at Svåsand that have their boathouses here, four main farms with origins far back in time.
On Austre Bakholmen, a small islet of around 15 acres between Hundvåko and Drøni, lies the oldest trading centres in Austevoll. For a long time this was a court location and it was a natural centre in this archipelago.