• One of Asia’s two main opium-producing areas.
• It is an area of around 950,000 square kilometres (367,000 sq mi) that overlaps the mountains of three countries of Southeast Asia: Myanmar, Laos and Thailand.
• Most of the world’s heroin came from the Golden Triangle until the early 21st century when Afghanistan became the world’s largest producer.
• The Golden Triangle designates the confluence of the Ruak River and the Mekong River, since the term has been appropriated by the Thai tourist industry to describe the nearby border tripoint of Thailand, Laos and Myanmar.

• The Golden Crescent is the name given to one of Asia’s two principal areas of illicit opium production (with the other being the Golden Triangle), located at the crossroads of Central, South, and Western Asia.
• This space overlaps three nations, Afghanistan, Iran, and Pakistan, whose mountainous peripheries define the crescent.

Source: Wikipedia