In 4000 BC Egypt were the earliest communities developed in lower Egypt or in upper Egypt?

In 4000 BC, the earliest communities in Egypt were primarily developed in Upper Egypt, where agriculture and settlement patterns began to emerge along the Nile River. This early civilization was characterized by the establishment of farming communities and the development of social structures. Over time, as these communities grew, Lower Egypt also became significant, particularly with the rise of cities like Memphis later in the early dynastic period.