The first ornithological field guide covering the vast chain of the Indonesian archipelago, with over 2,500 illustrations, describes all 1,417 bird species known to occur in the region, including 601 endemics, 98 vagrants, eight introduced species and 18 species yet to be formally described. Together these represent over 13% of global bird diversity. In addition, all subspecies from the region are described. The guide fully encompasses the biogeographic regions of the Greater Sundas (Sumatra, Borneo, Java and Bali) and Wallacea (Sulawesi, the Moluccas and the Lesser Sundas), plus all satellite islands. This region spans an arc of over 4,000 km along the Equator, including Brunei, East Timor, the Malaysian states of Sabah and Sarawak and most of the territory of the Republic of Indonesia. The authors' vast experience and knowledge of the region's birds brings together the latest taxonomic insights, knowledge of distribution, field identification features, vocalisations and more to create an indispensable reference for anyone with an interest in the avifauna of this fabulously diverse region.