Which sea borders Port Moresby on Papua New Guinea's south coast?

Which sea borders Port Moresby on Papua New Guinea's south coast? The answer is the Coral Sea.

Port Moresby stands on Papua New Guinea's south-western coast, beside the Gulf of Papua, which opens into the Coral Sea. The Coral Sea is a large marginal sea of the southwestern Pacific, lying between the east coast of Australia, Papua New Guinea and the Solomon Islands.

A common mix-up is the Gulf of Papua. It is the more immediate coastal water beside Port Moresby, while the Coral Sea is the broader named sea into which the gulf opens. The Bismarck Sea lies north of Papua New Guinea, and the Solomon Sea lies farther to the east, so neither borders the capital's south coast.

Port Moresby is Papua New Guinea's capital and largest city. Its coastal location helped make it an important port and, during World War II, a strategically significant base in the Pacific campaign.