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1.
A triangular patch of geography in Northern California, encompassing Mendocino and Humbolt counties, and home to world famous redwood trees and outdoor grown weed.
Joe: This weed is some good shit.
Snowflake: Yea, it from the emeral triangle.
by mikwat May 22, 2004
 
2.
An area in Northern California that consists of Mendocino, Humbolt and Trinity counties, that is THE PRIMO area for growing Marijuana.

It grows like a weed here, especially outdoors, because the climate is PERFECT for it.
The Emerald Triangle is the place to grow weed. Wine is also a huge crop in this area. We are just counties full of "Joy".
by Mendocino Grown Stoner chick April 16, 2009