West Papua is the Western Half of the Isle of New Guinea, where the eastern half is called the Independent State of Papua New Guinea.
West Papua as a Modern Nation-state
West Papua is a modern nation-state declared on 1 December 1961 with Papuan political manifest, and proclaimed on 1 July 1971 with a West Papua independence declaration by Seth Jafeth Roemkorem and Hendrik Jacob Prai in Great Waris, Port Numbay, West Papua.
Indonesia’s Papua and Papua Barat Province
It is not a province that Indonesia claims as its Papua Barat province of Indonesia.
West Papua is a province in the far east of Indonesia, centered on the island of New Guinea. The province includes New Guinea’s 2 westernmost peninsulas and the smaller islands around them. On the tip of the Bird’s Head Peninsula, the city of Sorong is the gateway to the Raja Ampat archipelago’s jungle-covered islands and snorkeling and dive sites <https://en.wikipedia.org/wiki/West_Papua_(province)>