What happens when a parking lot is built in a wetland area

The ground could sink and sink holes could occur, otherwise the parking lot could simply break apart and wear faster

I would say the most reasonable answer is that the soil doesn't support any type of construction very well. The land in a wetlands area is very moist and quite damp, leaving a dangerous outcome for many. It could cause buildings to collapse near it and cars could be destroyed. I wouldn't recommend building a parking lot on a wetland area!