ar·chi·pel·a·go /ˌɑrkəˈpɛləˌgo, ˌɑrʧə-/
群島,多島海
Ar·chi·pel·a·go, n.; pl. -goes or -gos
1. The Grecian Archipelago, or Ægean Sea, separating Greece from Asia Minor. It is studded with a vast number of small islands.
2. Hence: Any sea or broad sheet of water interspersed with many islands or with a group of islands.
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archipelago
n : a group of many islands in a large body of water
[also: archipelagoes (pl)]