Task: Question Understanding
Input (English): What is the collective name for the islands with a land area of 4,167 squ km (1,622 squ miles) over 2,500,000 squ km (965,255 squ miles) of ocean, made up of several groups of islands, including the Austral Islands, the Marquesas, the Society Islands and the Tuamotu Archipelago?
Output (English): austral islands