The eastern boundary of Malesia was placed between the Bismarck Archipelago and the Solomon Islands, which were put into region 60 Southwest Pacific. It was subsequently argued that it made more "floristic sense" to link the Solomon Islands with the Bismarck Archipelago and the island of New Guinea. Accordingly, in the second edition, a new region 43 Papuasia was created within Asia-Tropical, comprising New Guinea, the Bismarck Archipelago and the Solomon Islands, so that Asia-Tropical consists of four regions.[13]