Rain leaking into car

[Flanders]

Hi folks!
I've had some rain coming in the interior of the car in the back. I discovered it when I heard a sloshing sound under the spare tire. The car is a 2010 aveo hatchback.
I'm having a hard time finding out where the leak is. Are there any common issues like this one? One of the pictures i took suggests it comes from near one of the rear lights.

[Flanders]

Here are the pictures