Bangkok's full ceremonial Thai name, Krungthepmahanakhon Amonrattanakosin..., runs to 168 letters in its formal transliteration and is recognized by Guinness World Records as the longest official place name on Earth. A shorter 111-letter version is used in some contexts since Thai script has no capital letters.
Record no. MRB-2026-005775
Longest Official Place Name in the World
Reference Record – Not Certified
This record is compiled from publicly available sources for reference. It has not been examined or certified by The Book of World Records.