New map fact I learned tonight, reading Ken Jennings' new book, Maphead
The Canadian territory of Nunavut has the largest island on an island on an island
"There are several places where islands on islands in turn have lakes with islands – triple islands. The largest island on an island on an island is a 4 acre / 1.6 ha island in a lake on an island in a lake in south-central Victoria Island, Nunavut, Canada, at 69.7928° north, 108.2411° west."
doesn't mention orienteering by name (it does mention GPS and high-pointing), I sense a kindred spirit (map geek). :-)