Atlantic Ocean:
* The Azores (Portugal)
* The Canary Islands (Spain)
* The Cape Verde Islands
Pacific Ocean:
* Hawaii (USA)
* The Philippines
* Indonesia
* Fiji
* The Galapagos Islands (Ecuador)
Indian Ocean:
* The Maldives
* Seychelles
* The Comoros
Seas and Lakes:
* The Greek Islands
* The Bahamas
* The Thousand Islands (between Canada and the US)
* The Stockholm Archipelago (Sweden)
It's worth noting that there are many, many more archipelagos around the world. These are just a few of the most well-known.