A common word for a place used for staying overnight outdoors would be "campground" in AmE and "campsite" in BrE. However, I learned that Americans also use the word "campsite." My questions is to what extent, and are both terms used interchangeably?
Or maybe there is a difference with regard to the following meanings: an impromptu area (as one might decide to stop while backpacking or hiking); a dedicated area with improvements and various facilities
or maybe it depends more on the region of the US where the term is used?
Google Ngram displayed this:
so I can imagine both terms are pretty common. I am directing this question mainly to AmE native speakers. How do you feel about both terms?