Question

a group of closely scattered islands *
choose
isthmus
peninsula
island
archipelago
mountain

Explanation:

An isthmus is a narrow strip of land connecting two larger land areas. A peninsula is a landform surrounded by water on most sides but connected to the mainland. An island is a single piece of land surrounded by water. A mountain is a large landform that rises prominently above its surroundings. An archipelago is defined as a group of closely scattered islands.

Answer:

Archipelago