Definition:
20 km long sound by the inlet to Van Mijenfjorden, Van Keulenfjorden and Recherchefjorden, between Nordenskiöld Land and Wedel Jarlsberg Land, on the western side of Spitsbergen. The western limit of Bellsund is confined by a line between Lågneset to Straumsneset. Akseløya and Mariaholmen separate Bellsund from Van Mijenfjorden. In southeast, Bellsund is separated from Van Keulenfjorden by a line between Forsbladodden, through Eholmen to Richardodden. The southern limit of Bellsund is confined by a line from Reinodden to Pocockodden, separating it from Recherchefjorden

Origin:
Norwegian adaptation of Bellsound which has derived its name from a bell-shaped mountain Klokkefjellet, on the southern side of the mouth of the fiord