Golden Triangle
noun
(sometimes lowercase)
an area of Southeast Asia encompassing parts of Burma, Laos, and Thailand, significant as a major source of opium and heroin.
Canadian.
the peninsula enclosed by Lakes Ontario, Erie, and Huron.
British Dictionary definitions for golden triangle
golden triangle
noun
the Golden Triangle
an opium-producing area of SE Asia, comprising parts of Myanmar, Laos, and Thailand
any more or less triangular area or region noted for its success, prosperity, influence, etc
maths
a triangle which has two 72-degree angles and one 36-degree angle