What is the nation capital located near mouth of a river that empties into Mediterranean Sea with longitude 31 degrees east?

The nation capital located near the mouth of a river that empties into the Mediterranean Sea with longitude 31 degrees east is Cairo, Egypt. The Nile River flows through Egypt and empties into the Mediterranean Sea. Cairo is located at the northern tip of the Nile Delta, near the Mediterranean coast. The city is the capital of Egypt and has a population of over 20 million people.