Where did Jared diamond do his research for guns germs and steel?

Jared Diamond conducted his research for "Guns, Germs, and Steel" primarily in New Guinea and surrounding regions. His fieldwork involved studying the indigenous peoples, their cultures, and their environments, as well as examining the ecological and historical factors that influenced societal development. He also drew upon a wide array of interdisciplinary research from anthropology, Archaeology, Biology, and history to support his arguments.