Does Asia have any kind of transnational union, such as the EU?

I was looking around online, trying to figure out of if they have some kind of transnational union, but the closest thing I could find that resembled one is called the Asia Monitor Resource Centre: http://www.amrc.org.hk/ It definitely fits some criteria similar to the EU, but definitely not all. It’s non-governmental, for one.

Does anyone know if they have a similar kind of union? If so, can you please provide a link? I’m unsure as to how to go about searching on Google.