20 that include port moresby
Both Fiji and Papua New Guinea are islands.
The Solomon Islands are northeast of Australia and east of Papua New Guinea.
The 3 islands that are considered as a part of Indonesia are Sunda Islands, Maluku Islands and New Guinea. New Guinea is divided by Indonesian province of West Papua, Papua and Papua New Guinea.
No, Papua New Guinea is closer to the equator than the Solomon Islands.
Papua New Guinea
Papua New Guinea consists of the eastern half of the island of New Guinea - the islands of New Britain, New Ireland, Bougainville and around six hundred smaller islands, north of Australia.
Solomon Islands is a part of Melanesia since Melanesia includes the islands of New Guinea, Vanuatu (the former New Hebrides), New Caledonia, the Solomon Islands, and some smaller neighboring islands.
Melanesia
Papua/New Guinea, Australia
Papua New Guinea
Papua Province (Indonesia), Papua New Guinea, Solomon Islands, Vanuatu, New Caledonia (France), Fiji
The Torres Strait Islands lie between Cape York Peninsula and Papua New Guinea.