52.

The countries and regions that are included in each of the three regions are: Melanesia: Papua New Guinea, Solomon Islands, Fiji (part of which is classified as Polynesia), and Vanuatu; Polynesia: Tonga, Tuvalu, Samoa, Cook Islands, Niue, and Tokelau; Micronesia: Micronesia, Marshall Islands, Palau, Kiribati, and Nauru.