Went to Vientiane in Laos to do my Visa. That is the nearest Thai Embassy from Chiang Mai. 12 hour bus ride from Chiang Mai to Vientiane. For those who want to visit Chiang Mai, you may want to add Vientiane or Luang Prabang (additional 12 hours bus journey i heard)(Laos) in your itinerary.
To save time, it may be better to fly to Luang Prabang or Vientiane and go back from Chiang Mai.
To save time, it may be better to fly to Luang Prabang or Vientiane and go back from Chiang Mai.