The 2 Cities, Tachileik on the Burmese side of the border and Mai Sai on the Thai side of the border is a part of the golden triangle.
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The golden triangle is best known for its opium production, but the 2 cities is today well known for other reasons.
Mai Sai is is a very popular destination for Visa runs, used by foreigners in north Thailand. It is also a very popular day-trip destination for Thai tourist because of its abundant shopping opportunities on both sides of the border.
Mai Sai is also the most northern city of Thailand. The shops in Mai Sai are mostly selling food from the region, that is hard to come by in other parts of Thailand and the most comes from Burma. There are also a lots of cheap legal products from China. It is very popular for Thais to buy clothing and blankets ect. in Mai Sai.
Mai Sai and Tachileik is connected by a bridge over the Mekong river. The river is a part of the border between Thailand and Burma, and if you follow the river it is also a part of the border between Thailand and Laos.
The shops in Mai Sai are mostly selling food from the region, that is hard to come by in other parts of Thailand and the most comes from Burma. There are also a lots of cheap legal products from China. It is very popular for Thais to buy clothing and blankets etc. in Mai Sai.
Tachileik have almost everything in counterfeit goods from China, Cigarettes,Viagra, kitchen ware, brand items, fishing rods, every thing in electronics phones etc. you name it they have it.
The border control on the Thai side of the border have improved a lot, in the recent years, so you can no just walk over the border and bring everything you want.
It is not advisable to buy copy goods in Burma especially not Phones and other electronics, as you get x-rayed when you come back to Thailand.