Britain and Ireland.
There are many river islands in the British Isles but no two comprise them
Britain and Ireland.
Great Britain and Ireland are the two main islands but there are also hundreds more small off-shore islands.
Geographically, the British Isles are the two main islands of Great Britain and Ireland and all of their off-shore islands. Politically, they are comprised of the United Kingdom and the Republic of Ireland.
They are two large neighbouring islands. They are sometimes collectively referred to as the British Isles for geographic purposes.
The British Isles refers to the two large islands of Britain and Ireland and all their associated islands, and it also includes the Isle of Man and the Channel Islands. See the outline map below.
Samoa and American Samoa are both groups of islands in the Pacific Ocean about halfway between Australia and South America. Samoa is an independent country of two large islands.American Samoa is a group of five smaller islands nearby that comprise a Territory of the USA.
Two large islands in Europe are Great Britain and Ireland.
A bridge or a tunnel can connect two large islands.
There are only 3 nations which comprise Great Britain - England, Scotland and Wales. The 4 nations which comprise the United Kingdom of Great Britain and Northern Ireland (or UK for short) are England, Scotland, Wales and Northern Ireland. To further confuse matters, the British Isles comprise the island of Great Britain as well as the island of Ireland even though not all of Ireland is part of the UK - and also around 6,000 smaller islands that surround the two main islands.
The islands that surround the Caribbean Sea are the Caribbean Islands. The Caribbean Islands comprise more that 7000 islands, 13 of which are independent countries.
Hispanola is 1 island comprised of the 2 countries Haiti and the Dominican Republic.