Farthest North I've been: Lappeenranta, Finland. Farthest South I've been: Melbourne, Australia. Farthest East I've been: Albufeira, Portugal. Farthest West I've been: Auckland, New Zealand. For north, it’s a close call between Lappeenranta and Lerwick, but looking at coordinates, Lappeenranta just has it. For south, google says Auckland, but again, coordinates seem to suggest Melbourne. Happy to be corrected on either front