Going by the map below, peg 6 is missing from the lake in-game. Also, there seems to be an unused peg on the right side of Tylers Bay, just under peg 15, in the opening between the trees. There is a nice wooden pier in that spot that gives great access to the whole bay area, and I was really disappointed that I couldn't claim it! It would have been much better than pegs 17 and 15 that I was using. Correction: Peg 6 is there, but it's missing from the in-game map (initial spawn and quick-travel map).