Mariasundet is a sound in Nathorst Land at the mouth of Van Mijenfjorden at Spitsbergen, Svalbard; between Mariaholmen and Måseneset. While Akselsundet is regarded the main entrance into Van Mijenfjorden, Mariasundet is also navigable, although it contains the three sherries Svarten, Veslesvarten and Erta.
Coordinates: 77°40′40″N 14°49′56″E / 77.6777°N 14.8322°E