This goes back to the early 60's but...
North America - KFAR Fairbanks, AK 660 kHz 2,961 miles
World - Rockhampton, Australia 840 kHz 9,196 miles
Americas - LR3 Buenos Aires 950 kHz 5,460
Africa - Cairo 818 kHz< 5,900 miles
Europe Bucharest 854 kHz 5000 miles
I'm 250 miles away from KFAR 10kw, but even with my radios audio filter set to 1`khz bandwith, KFAR still gives fits to Pyongyang on 657.