Final Answer:
The country that has the cities of Novi Sad and Nis is Serbia.
Step-by-step explanation:
Novi Sad and Nis are prominent cities located in Serbia, a landlocked country situated in Southeast Europe on the Balkan Peninsula. Novi Sad, the capital of the northern province of Vojvodina, is known for its cultural events, historic Petrovaradin Fortress, and the EXIT music festival. Nis, in the southern part of Serbia, is one of the oldest cities in Europe, with a rich history dating back to Roman times.
It is recognized for landmarks like the Nis Fortress and the Skull Tower. Serbia, with its diverse geography and historical significance, offers a blend of cultural, historical, and contemporary attractions for visitors.