What are the two main islands that make up Great Britain?

The two main islands that make up Great Britain are England and Scotland. This is significant as Great Britain specifically refers to the largest island in the British Isles, which includes England, Scotland, and Wales. While Wales is also part of Great Britain, it does not pair with Scotland to form the two main islands, as it is located on the same island as England. Northern Ireland, on the other hand, is situated on a separate island called Ireland, which is distinct from Great Britain altogether. Therefore, the correct pairing of England and Scotland emphasizes the geography of the islands within the context of the United Kingdom.