Which geographical term describes a chain of islands, such as those in Indonesia and the Philippines?

The term that accurately describes a chain of islands is "archipelago." An archipelago consists of a group or chain of islands located close to each other in a body of water. This term is used specifically to highlight the connection between the islands, both in proximity and often in geological origin.

For instance, Indonesia and the Philippines are both made up of numerous islands that are closely positioned, making them classic examples of archipelagos. The Indonesian archipelago includes over 17,000 islands, while the Philippines has about 7,641 islands, all of which are interconnected in their geographical features.

Other terms such as a peninsula refer to a landform that is surrounded by water on three sides and does not relate to a collection of islands. An atoll refers to a specific type of coral island formed from coral reef structures and is typically more singular in nature. "Island group" is a more generic term that can describe a set of islands but does not carry the precise geographical definition that "archipelago" does. This makes "archipelago" the most appropriate term for a chain of islands.