A BIORAP is a biological inventory programme undertaken in marine and terrestrial environments, and is designed to rapidly assess the biodiversity of highly diverse areas. Options to manage threats and protect some remaining examples of indigenous biodiversity of national or international significance are recommended to governing communities.The Nauru BIORAP took place in selected terrestrial and marine areas of the Republic of Nauru during 17–27 June, 2013. The key finding of the Nauru BIORAP are presented in this synthesis report.