The Wikipedia article says: The question is: what is the exact border between the Armenian highland and the Iranian Plateau? And what is the exact border between the Armenian highland and the Anatolian Plateau?
You're probably going to have to find a topographic map of the region and follow the contour lines. Still, I don't see how geological boundaries could possibly be defined nearly as precisely as political boundaries. If you're riding along and you rise from the Anatolian Plateau into the Armenian Highland, and then drop back down into the Iranian Plateau, at what point on either of those inclines do you decide that you've left one region and crossed into the other? These boundary regions are much wider than the zero-thickness lines that define national borders. There could be entire towns, even provinces, that are "on the boundary."
Well, this is what geographers have been doing for the past few millenia. They have been setting geographic boundaries. I have made some progress. I think the eastern boundaries should be the Euphrates and the Anti-Taurus Mountains. The western boundaries though are still unclear, but I know that they begin at Zanjan. Also why do you assume that the Armenian Highland is higher than the other two plateaus? Actually it seems to be the lowest among the three.
All I know about it is what I read in Wikipedia. They said that the Iranian Plateau is the lowest. If you've got solid source material that contradicts that, please correct it.
