Question: the fertile crescent is located between what two bodies of water
[{'answer': 'Tigris', 'provenance': [{'wikipedia_id': '39715', 'title': 'Fertile Crescent', 'start_paragraph_id': 4, 'start_character': 1268, 'end_paragraph_id': 4, 'end_character': 1274, 'bleu_score': 1.0, 'section': 'Section::::Terminology.\n'}]}, {'answer': 'Euphrates', 'provenance': [{'wikipedia_id': '39715', 'title': 'Fertile Crescent', 'start_paragraph_id': 4, 'start_character': 1279, 'end_paragraph_id': 4, 'end_character': 1288, 'bleu_score': 1.0, 'section': 'Section::::Terminology.\n'}]}, {'answer': 'Tigris and Euphrates rivers'}, {'provenance': [{'wikipedia_id': '39715', 'title': 'Fertile Crescent', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1691099905941455769}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20189', 'title': 'Mesopotamia', 'section': 'Section::::Economy and agriculture.\n', 'start_paragraph_id': 115, 'end_paragraph_id': 115, 'meta': {'evidence_span': ['The need for irrigation led the Sumerians, and later the Akkadians, to build their cities along the Tigris and Euphrates and the branches of these rivers. Major cities, such as Ur and Uruk, took root on tributaries of the Euphrates, while others, notably Lagash, were built on branches of the Tigris. The rivers provided the further benefits of fish (used both for food and fertilizer), reeds, and clay (for building materials). With irrigation, the food supply in Mesopotamia was comparable to the Canadian prairies. The Tigris and Euphrates River valleys form the northeastern portion of the Fertile Crescent, which also included the Jordan River valley', 'The Tigris and Euphrates River valleys form the northeastern portion of the Fertile Crescent, which also included the Jordan River valley']}}]}]