It connects Cervo valley (BI) and Valsesia (VC), both in Piemonte (Italy).

In the local dialect croso means gully, small valley, maybe referring to the Valsesia's side of the pass, sharply eroded by water.

It belongs to the water divide between the drainage basins of Cervo and Sesia.

[2] Bocchetta del Croso can be accessed from south by a wide stone-paved trail starting from Montesinaro (1,037 m), a village belonging to the comune of Piedicavallo (BI).

On the opposite side the trail continues until Alpe Toso, from where is possible to reach Rassa (VC) or Gressoney-Saint-Jean (AO).