What is longest capital city name?

The longest capital city name is "Bangkok," which is often cited for its full ceremonial name: "Krung Thep Maha Nakhon Bovorn Ratchathani Buri Rom Udom Ratchaniwet Mahasanakham." This full name translates to "City of Angels, Great City of Immortals," and it consists of 163 letters in Thai. However, in terms of commonly used names, "Sri Jayawardenepura Kotte" in Sri Lanka is often recognized as the longest capital city name in English, comprising 24 letters.