Answer and explanation

Correct answer: C. The area where Thailand, Laos and Myanmar meet at the Mekong

  1. Step 1: The Ruak river joins the Mekong there. Step 2. It was once known for opium production. Answer: The area where Thailand, Laos and Myanmar meet at the Mekong. Why not the others: The other descriptions do not fit.

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What is the Golden Triangle? | General Knowledge (Thailand)