Task: Explanation
Input (English): Harpina (Ancient Greek: Ἆρπινα ) was an ancient city in Elis, Greece. It was a prehistoric city built next to the banks of the stream Harpinates, a tributary of the Alfeios. It was part of the city state of Pisatis and at the time of Pausanias it was ruined. Its name came from a nymph Harpina daughter of Aesop and, with Ares, mother of Oenomaus who was the founder of the city. Question: The stream which the city named after the daughter of a Greek fabulist and story teller is a tributary of which river? Answer: Alfeios
Output (English):  It was a prehistoric city built next to the banks of the stream Harpinates, a tributary of the Alfeios.