[3] The fjord is 13 kilometres (8.1 mi) long,[3] with a maximum depth of 302 metres (991 ft) at its mouth,[3] and it runs northeast from its mouth between Bruravik and Bagnsnes to the head of the fjord at the small village of Osa.

At Bruravik there was formerly a ferry connection across the Eid Fjord to Brimnes in the municipality of Eidfjord.

Norwegian County Road 572 runs along the west side of the Osa Fjord starting at Bruravik before it enters the Ulvik Fjord and continues to Ulvik.

At Ulvik it intersects with Norwegian County Road 300, which again leads to the west side of the Osa Fjord and continues to Osa.

The east side of the fjord has no road connections, and the only settlements there are the Bolstad farms near the mouth of the fjord.