To which cataract along the Nile did the southern boundary of the middle kingdom reach?

The southern boundary of the Middle Kingdom of Egypt reached the Second Cataract of the Nile. This marked the limit of Egyptian territory in the south during this period, as the Egyptians expanded their influence and control into Nubia. The Second Cataract, located near present-day Aswan, served as a significant geographical marker for trade and military campaigns.