Simplify the following text for a Grade 6 native English-speaking person.
Original: Jebel Barkal or Gebel Barkal is a very small mountain located some 400 km north of Khartoum , in Karima town in Northern State in Sudan , on a large bend of the Nile River , in the region called Nubia .
Simplified: Jebel Barkal , also called Gebel Barkal , is a small mountain located about 400 kilometers ( 248.6 miles ) north of a city called Khartoum , in the country of Sudan .