transition zone

Transition zone

Tran*si"tion zone\ (Biogeography) The zone lying between the Boreal and Sonoran zones of North America. It includes an eastern or humid subdivision and a western arid one of corresponding temperature comprising the northern Great Plains and the lower slopes of the mountains of the western United States and Mexico. Called also Neutral zone.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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