Thoughts on this province that Nubia and Ptolemaic Egypt fought over?

[Kisra]

In 275 or 274 BC, Ptolemy II (r. 283–246 BC) sent an army to Nubia, and defeated the Kingdom of Kush. The expedition pursued several objectives: on the one hand, it curbed Kushite power, which had been steadily expanding for the past century, and helped secure Ptolemaic rule against the native Egyptians of Upper Egypt, who might be tempted to seek Kushite aid in their revolts.

https://en.m.wikipedia.org/wiki/Triakontaschoinos