I just found the continental axis theory kinda weak when describing Europe, because both the trade and the cultures were dominated by the presence of the seas (

I just found the continental axis theory kinda weak when describing Europe, because both the trade and the cultures were dominated by the presence of the seas (Celtic, Mediterranean, Black, Caspian) that connect it all from England to France, Italy, Greece, Turkey, and all the way to Tehran. The closest you have in the temperate parts of Africa are Lakes Albert, Edward, Kivu, and Tanganyika to Lake Malawi, and perhaps Victoria. The great lakes are too far north, and the rivers of India and China are too sparse. You can barely traverse Australia today. Again, just look at a globe. There are boats (in Denmark no less) that are 10000 years old. Drawing of trade boats in Egypt are 6000 years old. I'd be surprised if travel and trade by boat wasn't common at the earliest stages of agricultural civilization.