Simplify the following text for a Grade 5 native English-speaking person.
Original: The drainage area covers 13,085 kmÂ ( Romania 8,085 kmÂ , Serbia 5,000 kmÂ ) .
Simplified: The TimiÅ River 's Drainage area covers 13.085 kmÂ ( in Romania 8.085 kmÂ , in Serbia 5,000 kmÂ ) .