For today's Geo Quiz, we're headed to southern China. That's where the world's biggest casino opened its doors today.

It's called "The Venetian" -- and it is HUGE. The developer claim it's the second-largest building in the world. And as the name implies -- it's modeled on the Italian city of Venice. Reporter Frederik Balfour was there for the over-the-top gala opening.

"There are 51 gondolas, they have an indoor and an outdoor canal...There is a St. Mark's square replica, there is a medieval clock tower...There's a replica of the Rialto bridge which is probably the most famous bridge in Venice.”

Rialto bridge

But this new casino is NOT in Venice.

It's in one of China's "Special Administrative Regions" -- the one that was once a Portuguese colony.

Can you name the place?

No worries if you can't -- we're back with the answer in just a few minutes.