What river divides the country which was home to Anerastia?
Anerastia: Anerastia is a genus of snout moths. Anerastia:  It was described by Hübner, in 1825, and is known from Egypt, Sudan. Sudan: The Sudan or Sudan ( , ; Arabic: السودان‎ ‎ "as-Sūdān") also known as North Sudan since South Sudan's independence and officially the Republic of the Sudan (Arabic: جمهورية السودان‎ ‎ "Jumhūriyyat as-Sūdān"), is a country in Northern Africa. Sudan:  The River Nile divides the country into eastern and western halves.
The River Nile