To extend your stay in Chiang Rai for an additional 30 days, you should visit the immigration office located at the Central Chiang Rai shopping mall. You will need to provide a TM30 form, as it is required for the extension process.
Apple *****
Central Chiang Rai shopping mall. Yes you need TM 30, they will ask for it.
Braulio *********
Perhaps a Google search takes too much effort 555
Brandon ************
The immigration office is at Central Chiang Rai. Easily found with a quick Google search.
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Brandon ************
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