| 100% | ALAND | 5 | — Islands, group of over 6,000 in the Gulf of Bothnia under Finnish administration |
| 54% | ALAND | 5 | Finnish island group in the Gulf of Bothnia |
| 38% | CAPRI | 5 | Island in the Gulf of Naples |
| 38% | CAPRI | 5 | Island off Italy in the Gulf of Naples |
| 37% | ISCHIA | 6 | Tourist island in the Gulf of Naples |
| 37% | MALDIVES | 8 | Nation of over 1,000 islands in the Indian Ocean |
| 37% | SAOTOME | 7 | __ and Príncipe: island country in the Gulf of Guinea |
| 36% | ALEUTIAN | 8 | — Islands, chain of over 150 islands in the Bering Sea off mainland Alaska |
| 35% | VAASA | 5 | Port on the Gulf of Bothnia; provisional capital of Finland in 1918 |
| 35% | VAASA | 5 | Port on the Gulf of Bothnia and capital of Finland in 1918 |
| 35% | SAOTOME | 7 | & 9D Island nation in the Gulf of Guinea whose landmarks include Pico Cao Grande |
| 34% | SAMOA | 5 | Group of volcanic islands in the south Pacific ocean |
| 34% | CYCLADES | 8 | Group of islands in the Aegean Sea including Anafi |
| 34% | AEGINA | 6 | Island of Greece in the Saronic Gulf south of Salamis |
| 34% | IOS | 3 | One of the islands in the Cyclades group |
| 34% | FIJI | 4 | Easternmost country in the Melanesia group of islands |
| 33% | DODECANESE | 10 | Group of islands in the Aegean Sea whose capital is Rhodes |
| 33% | KRONSTADT | 9 | Town in St Petersburg, Russia; site of a 1921 rebellion on an island in the Gulf of Finland |
| 33% | ARAN | 4 | — Islands, group of three isles in the Atlantic off the Republic of Ireland |
| 33% | MOLUCCAS | 8 | Group of islands in the Malay Archipelago also called the Maluku Islands |
| 33% | ANTILLES | 8 | Group of islands in the Caribbean consisting of the Greater — and Lesser — |
| 33% | MALDIVES | 8 | Group of coral islands in the Indian Ocean whose capital is Male |
| 33% | ARAN | 4 | — Islands, group of three isles in the Atlantic off Galway Bay, Republic of Ireland |
| 32% | MICRONESIA | 10 | Federated States of —, island group in the Pacific Ocean; capital Palikir |
| 32% | PERSIAN | 7 | Gulf in which the island of Bahrain is located |
| 32% | RHODES | 6 | Largest of the Dodecanese group of Greek islands in the Aegean Sea |
| 32% | PHI | 3 | When repeated, it's the name of an island group in Thailand |
| 32% | TRISTAN | 7 | & 21A Group of volcanic islands in the South Atlantic including Inaccessible and Nightingale |
| 31% | SOCOTRA | 7 | Island near the mouth of the Gulf of Aden that became part of South Yemen in 1967 |