Five shorelines where the join is not just a line on a chart but something you can stand and watch — a seam of broken water, a stone marker on the rocks, two currents shoving at each other offshore.
The village sits at Cape Agulhas, Africa's true southern tip — about 150 km east-southeast of the far more famous Cape of Good Hope. The 20°E meridian running south from the point is the agreed boundary between the Atlantic and Indian Oceans.
At Grenen, the sandbar beyond the town, the Skagerrak and the Kattegat collide head-on in a visible ridge of surf — and the spit is still growing, adding roughly 8 to 10 metres to the northeast every year.
The southern tip of mainland India, where the Bay of Bengal, the Arabian Sea and the Indian Ocean meet. On Chitra Pournami, the April full moon, the sun sets over one sea at almost the same moment the full moon rises out of the other.
Off the point, the Tasman Sea and the Pacific Ocean collide over Columbia Bank in a permanent line of whitewater. Despite the fame, it is not New Zealand's northernmost point: the Surville Cliffs at North Cape, 30 km east, sit about 3 km further north.
Punta de Tarifa, on the old island joined to the town by a causeway, is the southernmost point of continental Europe — sitting all but exactly on the 36th parallel at 36°00′00″N — and the causeway onto it is the official divide between Andalusia's Atlantic and Mediterranean coasts. Soaring birds will not cross open water if they can help it, so every autumn hundreds of thousands of raptors and storks funnel over this one 14-km gap.
Think you'd have found them? Play today's expedition, or replay this one from the archive.