孤島

1. Origins, structure, and basic meaning

• Structure: 孤島, read ことう, denotes an isolated island cut off from other places and difficult to reach.
• Basic usage: It names a remote island reached by a castaway in a story or selected for ecological study.

2. Common pitfalls and similar expressions

• Isolation rather than distance alone
  • It is an island isolated from other places and difficult to access, not merely one that is far away.