Thais will never call their capital city Bangkok. Instead in Thai it is known as Krung Thep (กรุงเทพ), which roughly translates to ‘City of Angels’.
In the official English romanisation, this is certified as the longest place name in the world in the Guinness book of records. It’s pronounced like:
Krung Thep Mahanakhon Amon Rattanakosin Mahinthara Ayuthaya Mahadilok Phop Noppharat Ratchathani Burirom Udomratchaniwet Mahasathan Amon Piman Awatan Sathit Sakkathattiya Witsanukam Prasit.