Question: where does the arkansas river join the mississippi river
[{'answer': 'eastern Arkansas', 'provenance': [{'wikipedia_id': '267577', 'title': 'Arkansas River', 'start_paragraph_id': 13, 'start_character': 424, 'end_paragraph_id': 13, 'end_character': 440, 'bleu_score': 1.0, 'section': 'Section::::Physical geography.:Hydrography.\n'}]}, {'provenance': [{'wikipedia_id': '267577', 'title': 'Arkansas River', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 482, 'bleu_score': 0.9735040436119741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3374199239109050765}, 'section': 'Section::::Physical geography.:Hydrography.\n'}]}]