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
| APA | Webster's. (2011). transition zone. Retrieved September 23, 2026, from http://smartdefine.org/transition_zone/definitions/2074038 |
| Chicago | Webster's. 2011. "transition zone" http://smartdefine.org/transition_zone/definitions/2074038 (accessed September 23, 2026). |
| Harvard | Webster's 2011, transition zone, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/transition_zone/definitions/2074038>. |
| MLA | Webster's. "transition zone" 28 May 2011. Web. 23 September 2026. <http://smartdefine.org/transition_zone/definitions/2074038> |