Been playing around with the planner, and have worked out that the max square I can get to before I have to get very creative with either substantial (2-3km) swims, is a 50x50. There is one square near here that I'm either gonna need a canoe, or a 1.5km swim, but it at least is officially listed as a swimming location, unlike the 3 tiles creating the 50 limit above, which are the main channel Separating Flevoland from the mainswamp^Wmainland. Would it be extravagant to get a sea kayak just to help collect tiles?
The downside of this is I'm gonna have to discard most of the square I have already built up. The Ijmeer gets in the way, sure it's only about 3x3 tiles, that are blocking things, but there's no way I can get there with a kayak, or swimming, it's too big a shipping area.
Apparently the record is 85x85 tiles.
Challenge accepted...
J