The schengen zone is exactly this hub agreement isn't it?

IIRC schengen zone is about people, not about goods. There are like 10 almost overlaping zones. This is a map recently posted by amenghra:

	▲	rsynnott 15 hours ago \| parent [-]
		Even this one understates it; it’s missing the special customs zone with Turkey.

Is Schen-zen a city in China?

Edit: The OP wrote 'schenzen' instead of 'schengen' before. That was the joke. Invisible now.