If you were to sail directly from the southernmost tip of Africa—Cape Agulhas—to the westernmost edge of Australia—near Perth—you would travel approximately 5,400 to 5,416 miles (about 8,700 to 8,715 kilometers)**. This distance represents the straight-line ("as the crow flies") sailing distance between these two points

. Cape Agulhas is the true southernmost point of Africa, located about 105 miles southeast of Cape Town

. The westernmost edge of Australia near Perth is the closest major city on the west coast of Australia. To summarize:

• Southernmost tip of Africa: Cape Agulhas
• Westernmost edge of Australia (approximate): Perth
• Approximate direct sailing distance: 5,400–5,416 miles (8,700–8,715 km)

This gives a good estimate for the direct maritime distance you would cover sailing between these two points.