There are several Appendices located after the end of the Return of the King story; the last section of the book, in any publisher version.

They detail the background of the Lord of the Rings, in part the Third Age before the Great Years, much of which is only briefly mentioned or hinted at in the story.

There are 6 of them:

• Appendix A
• Appendix B
• Appendix C
• Appendix D
• Appendix E
• Appendix F