Question: where is the mekong river located on a world map
[{'answer': 'in Southeast Asia', 'provenance': [{'wikipedia_id': '69147', 'title': 'Mekong', 'start_paragraph_id': 1, 'start_character': 37, 'end_paragraph_id': 1, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '69147', 'title': 'Mekong', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 211, 'bleu_score': 0.6199901252383141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10597648816343721753}, 'section': 'Section::::Abstract.'}]}]