I am from Europe/EU.
I first got to Chiang Mai with a flight and got a 30 day on arrival visa (June 2017). Then I extended the visa at Chiang Mai Immigration Office for another 30 days. Then I extended the visa for another 30 days by doing a Mae Sai visa run (crossing border with Burma/Myanmar and back on same day).
I want to extend for another 30 days, do I have to do my 2nd and last Mae Sai Visa Run or is it also possible to extend the visa again one last time directly in Chiang Mai at the Immigration Office? So is it possible in 2017 to extend a 30 day visa which I got at Mae Sai border, to extend such a visa at Chiang Mai Immigration Office for another 30 days?