It's quite funny how our local communities name things. A lot of things here are also not called by their proper term, but many have to use such terms for better communication. Mind you, I wasn't critising you, just trying to get clarification.
About plateau, you are absolutely right. It's a very uniqe state here. But how come you make charts for Nigerian aviation?
It was really funny, I realized what I had done, I have no reason to take offense. Did you know that all the sneakers are called adidas in Romania and all copiers are called xerox, informally? The verb for copy is called "to xerox" something. It's how the communities named things that they encountered for the first time and they stuck with us.
Yeah, it is indeed very funny. There are lots of cases here too. For instance, small packs of sausage sold here are called "gala" because gala was the first brand of such packed sausages. Another one is "Macleans" a brand of toothpaste, most people (especially the illeterates) call any toothpaste Macleans.
Illiterates? I bet you called it macleans not too long!