Myanmar, the country also known as Burma, has a long history of civil war and insurgency.

Most of the conflicts have now ground to a halt, but they have left behind a patchwork of rebel-held territories where the Burmese army dare not go.

Special Region Number Four - also known as Mong La - is one such strip of land on the border between China and Myanmar.

It has existed entirely outside central government control for more than 25 years.

The BBC's Myanmar Correspondent Jonah Fisher visited Mong La, a land where anything and everything goes.