user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: Where was the ancient Mesopotamian region? 
Knowledge Triplets: Battle of Walaja, time.event.included_in_event, Muslim conquest of Persia
Fao Landing, time.event.locations, Mesopotamia
Second Battle of Kut, time.event.included_in_event, Mesopotamian campaign
Mesopotamia, book.book_subject.works, Ancient Mesopotamia
Mesopotamia, location.location.contains, Middle East
The Sacred Band, book.written_work.subjects, Mesopotamia
Thoma Darmo, people.person.place_of_birth, Mesopotamia
Mesopotamia, location.location.events, Byzantine–Sasanian wars
Mesopotamia, location.location.people_born_here, Ziryab
Ottoman–Safavid War, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Anastasian War
Babylonian War, time.event.locations, Mesopotamia
Early Mesopotamia, book.written_work.subjects, Mesopotamia
Mesopotamian campaign, time.event.includes_event, Battle of Sheikh Sa'ad
Mesopotamia, common.topic.notable_for, g.125dngydv
A History of the Ancient Near East, book.written_work.subjects, Mesopotamia
Iberian War, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, book.book_subject.works, Ancient Iraq
Mesopotamia, location.location.events, Byzantine–Sasanian War of 602–628
Battle of Barbalissos, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, location.location.events, Fao Landing
Mesopotamia, location.location.events, Campaigns of Hammurabi
Battle of Susa, time.event.included_in_event, Assyrian conquest of Elam
Mesopotamia, location.location.events, Battle of River
Mesopotamia, location.location.events, Battle of Walaja
Fall of Baghdad, time.event.included_in_event, Mesopotamian campaign
Battle of Susa, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Assyrian conquest of Elam
Mesopotamian campaign, time.event.includes_event, Battle of Wadi
Byzantine–Sasanian War of 572–591, time.event.included_in_event, Roman–Persian Wars
Roman–Parthian Wars, time.event.locations, Mesopotamia
Campaigns of Hammurabi, time.event.locations, Mesopotamia
Trends of Mesopotamian Bronze Age, common.image.size, m.029115t
Battle of Barbalissos, time.event.locations, Mesopotamia
Mesopotamia, book.book_subject.works, Ancient Mesopotamia: portrait of a dead civilization
Mesopotamia, book.book_subject.works, Antico Oriente
Antico Oriente, book.written_work.subjects, Mesopotamia
Mesopotamia, location.location.events, Mesopotamian campaign
Roman–Persian Wars, time.event.includes_event, Roman–Parthian Wars
Mesopotamia, location.location.events, Byzantine–Sasanian War of 572–591
Mesopotamia, location.location.events, Muslim conquest of Persia
Mesopotamia, location.location.events, Battle of Samarra
Mesopotamia, location.location.events, Battle of Ctesiphon
Ancient Mesopotamia: portrait of a dead civilization, book.written_work.subjects, Mesopotamia
Mesopotamia, location.location.events, Battle of Edessa
Mesopotamia, book.book_subject.works, A History of the Ancient Near East
Roman–Persian Wars, time.event.includes_event, Siege of Singara
Siege of Singara, time.event.locations, Mesopotamia
Mesopotamia, common.topic.notable_types, Literature Subject
Julian's Persian expedition, time.event.locations, Mesopotamia
Roman–Parthian Wars, time.event.includes_event, Roman–Parthian War of 161–166
Roman–Persian Wars, time.event.includes_event, Battle of Samarra
Mesopotamian campaign, time.event.includes_event, Battle of Qurna
Mesopotamian campaign, time.event.includes_event, Battle of Es Sinn
Mesopotamia, location.location.events, g.122hjjds
Mesopotamia, book.book_subject.works, Myths from Mesopotamia
Mesopotamia, location.location.events, Battle of Es Sinn
Ziryab, people.person.place_of_birth, Mesopotamia
Battle of Samarra, time.event.included_in_event, Roman–Persian Wars
Assyrian conquest of Elam, time.event.includes_event, Battle of Susa
Muslim conquest of Persia, time.event.includes_event, Battle of River
Trends of Mesopotamian Bronze Age, common.image.appears_in_topic_gallery, Mesopotamia
Fao Landing, time.event.included_in_event, Mesopotamian campaign
Battle of Resaena, time.event.included_in_event, Roman–Persian Wars
Roman–Persian Wars, time.event.includes_event, Battle of Misiche
Mesopotamia, location.location.events, Antony's Parthian War
Kitos War, time.event.locations, Mesopotamia
Muslim conquest of Persia, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Roman–Persian Wars
Battle of Firaz, time.event.locations, Mesopotamia
Mesopotamia, location.location.contains, Ur Kaśdim
Mesopotamian campaign, time.event.includes_event, Second Battle of Kut
Mesopotamia, location.location.events, Kitos War
Roman–Persian Wars, time.event.includes_event, Battle of Edessa
Mesopotamia, location.location.people_born_here, Enheduanna
Roman–Persian Wars, time.event.includes_event, Battle of Barbalissos
Ancient Mesopotamia, book.written_work.subjects, Mesopotamia
Antony's Parthian War, time.event.included_in_event, Roman–Parthian Wars
Battle of Wadi, time.event.included_in_event, Mesopotamian campaign
Myths from Mesopotamia, book.written_work.subjects, Mesopotamia
Antony's Parthian War, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Battle of Firaz
Conquests of Sargon of Akkad, time.event.locations, Mesopotamia
Mesopotamia, book.book_subject.works, I, the Sun
Battle of Samarra, time.event.locations, Mesopotamia
Battle of Misiche, time.event.included_in_event, Roman–Persian Wars
Roman–Persian Wars, time.event.locations, Mesopotamia
Battle of Edessa, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, location.location.events, Battle of Misiche
Battle of Qurna, time.event.included_in_event, Mesopotamian campaign
Battle of Walaja, time.event.locations, Mesopotamia
Mesopotamia, location.location.people_born_here, Thoma Darmo
Byzantine–Sasanian War of 602–628, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Julian's Persian expedition
Trends of Mesopotamian Bronze Age, common.topic.image, Mesopotamia
Mesopotamia, location.location.events, Armenian–Parthian War
Roman–Persian Wars, time.event.includes_event, Anastasian War
Mesopotamia, book.book_subject.works, Mesopotamia
Ur Kaśdim, location.location.containedby, Mesopotamia
Muslim conquests, time.event.locations, Mesopotamia
Muslim conquest of Persia, time.event.includes_event, Battle of Walaja
Overview map of ancient Mesopotamia, common.image.appears_in_topic_gallery, Mesopotamia
Siege of Amida, time.event.locations, Mesopotamia
Battle of River, time.event.included_in_event, Muslim conquest of Persia
Mesopotamia, location.location.events, Siege of Singara
Mesopotamia, location.location.events, Battle of Sheikh Sa'ad
Middle East, location.location.contains, Mesopotamia
Siege of Singara, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, location.location.people_born_here, Noah
Byzantine–Sasanian War of 572–591, time.event.included_in_event, Byzantine–Sasanian wars
Battle of Wadi, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Byzantine–Arab wars
Mesopotamia, location.location.events, Siege of Amida
Byzantine–Sasanian wars, time.event.locations, Mesopotamia
Byzantine–Sasanian War of 572–591, time.event.locations, Mesopotamia
Byzantine–Sasanian wars, time.event.includes_event, Byzantine–Sasanian War of 602–628
Iberian War, time.event.locations, Mesopotamia
Ancient Iraq, book.written_work.subjects, Mesopotamia
Siege of Amida, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, location.location.events, Battle of Qurna
Mesopotamia, location.location.events, Battle of Wadi
Mesopotamia, location.location.containedby, Middle East
Mesopotamia, location.location.events, Fall of Baghdad
Mesopotamia, location.location.events, Iberian War
Mesopotamia, location.location.geolocation, m.0wm8p4h
Mesopotamia, book.book_subject.works, Early Mesopotamia
Anastasian War, time.event.included_in_event, Roman–Persian Wars
Muslim conquest of Persia, time.event.includes_event, Battle of Firaz
Abraham, people.person.place_of_birth, Mesopotamia
Mesopotamia, common.topic.image, Overview map of ancient Mesopotamia
Battle of Misiche, time.event.locations, Mesopotamia
Franco-Turkish War, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Second Battle of Kut
Mesopotamia, location.location.events, g.121yygys
Noah, people.person.place_of_birth, Mesopotamia
Mesopotamia, location.location.events, Nader's Mesopotamian Campaign
Mesopotamia, location.location.events, Franco-Turkish War
Roman–Persian Wars, time.event.includes_event, Siege of Amida
I, the Sun, book.written_work.subjects, Mesopotamia
Mesopotamia, location.location.events, Ottoman–Safavid War
Seleucid–Parthian wars, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Roman–Parthian War of 161–166
Assyrian conquest of Elam, time.event.locations, Mesopotamia
Roman–Persian Wars, time.event.includes_event, Byzantine–Sasanian War of 572–591
Mesopotamia, location.location.events, Roman–Parthian Wars
Muslim conquests, time.event.includes_event, Muslim conquest of Persia
Mesopotamian campaign, time.event.includes_event, Fall of Baghdad
m.09dvqm4, base.ontologies.ontology_instance_mapping.freebase_topic, Mesopotamia
Roman–Persian Wars, time.event.includes_event, Byzantine–Sasanian wars
Roman–Parthian War of 161–166, time.event.included_in_event, Roman–Parthian Wars
Battle of Edessa, time.event.locations, Mesopotamia
Nader's Mesopotamian Campaign, time.event.locations, Mesopotamia
Second Battle of Kut, time.event.locations, Mesopotamia
Battle of Qurna, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Battle of Barbalissos
Mesopotamian campaign, time.event.includes_event, Fao Landing
Mesopotamia, book.written_work.subjects, Mesopotamia
Battle of Resaena, time.event.locations, Mesopotamia
Byzantine–Sasanian wars, time.event.includes_event, Byzantine–Sasanian War of 572–591
Muslim conquest of Persia, time.event.included_in_event, Muslim conquests
Battle of Firaz, time.event.included_in_event, Muslim conquest of Persia
Byzantine–Sasanian War of 602–628, time.event.included_in_event, Byzantine–Sasanian wars
Battle of Es Sinn, time.event.included_in_event, Mesopotamian campaign
Roman–Parthian War of 161–166, time.event.locations, Mesopotamia
Roman–Parthian Wars, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, location.location.events, g.122101b9
Mesopotamia, base.ontologies.ontology_instance.equivalent_instances, m.09dvqm4
The Art and Architecture of Mesopotamia, book.written_work.subjects, Mesopotamia
Mesopotamia, location.location.events, g.11h1tp77t
Mesopotamia, book.book_subject.works, The Art and Architecture of Mesopotamia
Battle of Ctesiphon, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Battle of Resaena
Mesopotamia, common.topic.article, m.05254
Mesopotamia, location.location.events, Conquests of Sargon of Akkad
Mesopotamia, location.location.events, Babylonian War
Armenian–Parthian War, time.event.locations, Mesopotamia
Battle of Sheikh Sa'ad, time.event.included_in_event, Mesopotamian campaign
Fall of Baghdad, time.event.locations, Mesopotamia
Mesopotamia, common.topic.image, Trends of Mesopotamian Bronze Age
Battle of Es Sinn, time.event.locations, Mesopotamia
Byzantine–Arab wars, time.event.locations, Mesopotamia
Roman–Parthian Wars, time.event.includes_event, Antony's Parthian War
Mesopotamia, common.topic.image, m.02bbwby
m.02bbwby, common.image.appears_in_topic_gallery, Mesopotamia
Battle of Ctesiphon, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, location.location.events, Seleucid–Parthian wars
Roman–Persian Wars, time.event.includes_event, Battle of Ctesiphon
Anastasian War, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, g.121ysxlm
Byzantine–Sasanian wars, time.event.included_in_event, Roman–Persian Wars
Mesopotamia, book.book_subject.works, The Sacred Band
Enheduanna, people.person.place_of_birth, Mesopotamia
Mesopotamia, location.location.events, g.120khcch
Mesopotamia, location.location.people_born_here, Abraham
Mesopotamia, location.location.events, Battle of Susa
Roman–Persian Wars, time.event.includes_event, Battle of Resaena
Battle of Sheikh Sa'ad, time.event.locations, Mesopotamia
Mesopotamian campaign, time.event.locations, Mesopotamia
Mesopotamia, location.location.events, Muslim conquests
Battle of River, time.event.locations, Mesopotamia
Roman–Persian Wars, time.event.includes_event, Iberian War

Answer: Middle East