This is the 3671st most frequent Chinese word.
群岛
Archipelago.
Here, '群岛' refers to multiple sets of islands collectively forming the geographical structure of a country.
这个国家由许多群岛组成。
This country is composed of many archipelagos.
In this sentence, '群岛' is used to describe the geographical characteristic concerning a nation's landscape consisting mainly of islands.
印度尼西亚是世界上最大的群岛国家之一。
Indonesia is one of the largest archipelago countries in the world.
Here, '群岛' indicates a specific unnamed archipelago intended for exploration by the team.