Which sea lies between New Guinea and the Solomon Islands?

The sea between New Guinea and the Solomon Islands is the Solomon Sea.

The Solomon Sea is part of the western Pacific Ocean, lying between Papua New Guinea and the Solomon Islands archipelago. Its boundaries also bring it near Bougainville, New Britain, the Louisiade Archipelago and the Coral Sea. The sea is named for the Solomon Islands, whose name arose from 16th-century Spanish exploration and a biblical association with King Solomon’s fabled wealth.

This region is tectonically active. The Solomon Sea includes the New Britain Trench, where subduction helps produce very deep seafloor; Planet Deep reaches about 9,140 metres below sea level. The area also experienced major naval and air battles during the Pacific theater of World War II.

A common mix-up is the Coral Sea, which lies south of the Solomon Sea, or the Bismarck Sea, which lies to its northwest. The question’s wording points specifically to the basin separating New Guinea from the Solomon Islands.