c. 5600 BC – Beginning of the desertification of north Africa, which ultimately lead to the creation of the Sahara desert. It's possible this process pushed some natives into migrating to the region of the Nile in the east, thereby laying the groundwork for the rise of Egyptian civilization.
c. 5600 BC – Red Paint people seem to have established a trans-atlantic domain which includes North American Labrador to New York state, and the northwestern coast of Europe
c. 5600 BC – According to the Black Sea deluge theory, the Black Sea floods with salt water. Some 3000 cubic miles (12,500 km³) of salt water is added, significantly expanding it and transforming it from a fresh-water landlocked lake into a salt water sea.
1 September 5509 BC – day of creation of the world (according to the Byzantine Empire) and beginning of their calendar
c. 5500 BC – Oceans rise several meters, followed by a subsidence in levels afterwards to that approximating the present.