What are the odds of this happening?

[timex]

Its pretty hard to calculate the odds of this happening, but a couple years ago our family went camping in the north eastern states, and we are from near Toronto, Ontario, we met someone else from the same place as us at one campground, at the next campground we stayed at they were camping right beside our site, and 2 campgrounds later, they were right across from us. We were going camping in a fairly random set of campgrounds, not like a set path where all people going in that direction would stay at the same campgrounds.