Thai soldiers seized four million meth pills hidden in a forest near neighbouring Myanmar.

The troops were on patrol along the border when they spotted the suspicious containers lying in the undergrowth in Chiang Rai on June 14.

They called for reinforcements to secure the area before collecting the sacks tucked away in tall grass and forest detritus. Upon inspection, they discovered packs of bright orange meth pills stamped with the letters 'WY' inside.

Authorities said four million meth pills were confiscated.

Major General Anuwat Panyanant, commander of the special unit assigned to the area, added: 'We believe the drugs came from a neighbouring country and were destined for inner Thailand. They were kept here for storage, but we managed to intercept them first.'

The military chief said that the narcotics were handed over to the Mae Fa Luang Police Station for processing.

The meth bust came just three days after a million meth pills were seized from suspected smugglers in the same province.

Border patrol troops clashed with five armed suspects in a dense forest on June 11. The alleged drug couriers fled the scene leaving behind five blue sacks each containing 250,000 meth tablets.

Chiang Rai sits along the Golden Triangle, where most of Southeast Asia's meth supply comes from.

The region is found where the borders of Thailand, Laos, and Myanmar meet but it has long been a feral nest of criminal activity, including opium production, meth labs and call centre scam bases.

At the heart of the Golden Triangle lies the Golden Triangle Special Economic Zone (GTSEZ), run by notorious Chinese business tycoon and suspected crime boss Zhao Wei in the Chinese vassal state Laos. Communist chiefs are said to turn a Nelsonian eye to his wrongdoing.

In 2007, Zhao brokered a deal with the Laos government and obtained a 99-year lease to build the zone on a 39-square mile patch of impoverished Bokeo province.

The Chinese businessman claims to be a benefactor as he touts the GTSEZ as a tourist and economic hub designed to bring more income and investments into the country. However, both local and international law enforcement agencies believe it is a front for organised crime, including human trafficking, drug trafficking, and call-centre scams.

International authorities have struggled to take down the gambling empire as the Laos government itself is said to be protecting the GTSEZ, in which it has a 20 per cent stake.