No Nautical Miles Between Adelaide and Columbus, Ohio — They're on Different Continents

Nautical miles measure distance over water. Since Columbus, Ohio is landlocked (400+ km from Lake Erie, 1,000+ km from Atlantic), and Adelaide, Australia is on the Southern Ocean, there is no continuous water route — hence no nautical mile distance.

What Exists Instead

• Great-circle (air) distance: ~15,800 km (9,800 mi / 8,500 nmi)
• Flight time: 22–28 hrs (1–2 stops: PER/SIN/DOH → LAX/ORD → CMH)
• No passenger ships: No scheduled ocean liner service Australia ↔ US Great Lakes / East Coast

If You Meant "Nautical Miles" as Colloquial for "Distance"

The air distance is ~8,500 nautical miles. But technically, nautical miles only apply along a rhumb line or great circle over navigable water — which doesn't exist here.

For Adelaide ↔ Columbus, use kilometers, miles, or flight hours. Nautical miles are for mariners.