Solomon Sea. The Solomon Sea is a sea located within the Pacific Ocean. It lies between Papua New Guinea and Solomon Islands. Many major battles were fought there during World War II. Extent The International Hydrographic Organization defines the limits of the Solomon Sea as follows: On the Northwest. By the Southeast limit of Bismarck Sea [A line from the Southern point of New Ireland along the parallel of 4??50' South to the coast of New Britain, along its Northern coast and thence a line from its Western extreme through the Northern point of Umboi Island to Teliata Point, New Guinea (5??55???S 147??24???E)]. On the Northeast. By a line from the Southern point of New Ireland to the North point of Buka Island, through this island to the Northwest...