Standing water found in spare tire area only, where can this water come from? on 2007 Honda Accord

I noticed water under the back of the car. When I checked the trunk I noticed standing water in the spare tire area of the trunk only?

Asked by for the 2007 Honda Accord
Trunk seal leaking! Is Potwin close to where Mat Dillon was the marshal?? What was the name of that town......Oh yeah, Kanas City,, no .....Oh it was Dodge!!! Yall get many visitors there? Anything to see in Potwin Kansas,, places to go fishing and such? Are there any dirt roads left there?
1 more answer , 1 more comment
Don't know where Potwin Ks. is, Does it rain there?