Doing an oil change yesterday I found this on the cross member under and rear of the engine.

Click image to enlarge

Click image to enlarge

It's the drain hopper from under the wiper scuttle cover. Without it water can drain into the vehicle. 2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ionic 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.

Wow thanks for that speedy reply. Not sure how that migrated to under the engine.
I will have to take the wiper scuttle off and explore where it should be.

You won't need to remove the scuttle cover. I think there is only one on the battery side. If you look at the scuttle cover in the coner there are two small drain holes (probably blocked) the drain hopper is located below those holes, should be able to feel around or use a torch to see where it goes. 
Hung like Einstein, smart as a horse.

Thanks, I would never have found that.
Put the hopper back in place. Interesting that the drain holes you mention are not present. Not sure what that hopper will do as there are no holes above it.

There are about 6 drain holes in the scuttle panel, tiny drillings in places where water can collect if blocked (they are normally blocked), this rubber hopper goes below the most LH holes, behind the battery area below the scuttle. 2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ionic 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.

Cheers, all fitted back in place. Still searching for those drain hole though. If

Found them, drain holes so blocked, I could not see them.

Two down , four to go, no more clues though.  
Hung like Einstein, smart as a horse.

Below the wiper spines.  2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ionic 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.