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If you are talking about the boot / trunk area then there are plugs on either side of the the little wells behind the rear wheels and one in the spare wheel well. To get to the sides you need to remove the plastic liners. You can reach the plugs from under the car but it is often best to make sure everything is dry on the inside as soon as you can.
The leaks for this back part of the vehicle usually happen because of failure of the back windscreen (rust), the rear lights, the trunk / boot seal, the overflow + seal around the fuel filler cap and if you're really unlucky rusty sunroof drains on the C pillar (saloon / sedan)
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If you've got a wet rear passenger floor then the leaks at the front of the vehicle need to be considered (along with any sunroof leaks)
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