Simplify the following text for a Grade 8 native English-speaking person.
Original: The river Ozama is the eastern limit of the Distrito Nacional and separates it from Santo Domingo Este , head municipality of the Santo Domingo province . The river Isabela , a tributary of the Ozama , is the northern limit of the Distrito Nacional and separates it from Santo Domingo Norte
Simplified: The first line connects the Distrito Nacional with Santo Domingo Norte .