300E, Water in Passenger Floorboard

When it rains, water finds its way to the area below the front passenger floor mat.

Are there any under hood or cowl drains that I should check. I have eliminated the evaporator drain as the source of water. I have checked all the areas I can see looking for drains that might be clogged and causing this problem.

Any sharing of related experience is appreciated.

Have a great day,