Cannabis-growing region of northern California, USA
The Emerald Triangle is a region in Northern California that derives its name from being the largest cannabis-producing region in the United States. The region includes three counties in an upside-down triangular configuration: . Humboldt County, on the coast. Trinity County, inland. Mendocino County, to the south. Growers have been cultivating Cannabis plants in this region since the 1960s, during San Francisco's Summer of Love.
https://en.wikipedia.org/wiki/Emerald_Triangle