60 degrees might make sense from a South American perspective, but for them anything much further North could put it next to much of Argentina and Chile. I thi

60 degrees might make sense from a South American perspective, but for them anything much further North could put it next to much of Argentina and Chile. I think a boundary based on continental features makes more sense. So a boundary on great circles from, roughly, Windy Harbour Australia, to Cape Town, to Isla Hermite, then back to Tasmania.