The number and classification of islands in Croatia varies over time and by different measurements, causing some domestic controversy when discrepancies are found. The Croatian Bureau of Statistics uses data from the Geographical Department of the Faculty of Science of the University of Zagreb, which classifies a total of 1,185 islands, rocks and reefs: 48 inhabited islands, 670 uninhabited islands (Croatian: otoci), 389 rocks (hridi) and 78 reefs (grebeni). The Hydrographic