The name of the river to which the borders of the Egyptian kingdom reached in the north?

It was the Euphrates River. During the reign of Thutmose 3 (events fall in the 15th century BC), the Egyptians were able to expand their borders up to this river. Interestingly, the Egyptians themselves were very surprised when they saw the Euphrates River. They were not used to the fact that the river flowed from north to south, and not from south to north, like the Nile. In this connection, they called this river “Upside Down River” or “Reverse River”.