
Phitsanulok Deputy Governor Thatchai Sisuwan and Third Army Region commander Lt-Gen Vichak Siribansop led state officials and other proud citizens in singing the national anthem at 8am to celebrate the historic milestone.
They then presided at a ceremony in which the Rakthongchatthai 189 Foundation formally presented the 40-by-60-metre flag.
The flag weighs 600 kilograms and required 300 people to open it fully.
The flag will fly from a 189-metre-tall pole in Chiang Rai’s Chiang Saen district, becoming a new landmark signifying national unity.