Simplify the following text for a Grade 8 native English-speaking person.
Original: The Shyok flowing in a wide valley suddenly enters a narrow gorge after Chalunka and then joins the Indus at Skardu ( Pakistan ) .
Simplified: The Shyok flows in a wide valley , suddenly entering a narrow gorge after Chalunka , continuing through Turtuk and Tyakshi before crossing into Pakistan . The Shyok joins the Indus at Keris , to the east of the town of Skardu .