Please answer the following question: Information:  - The is the fourth largest river in Japan and the largest in the Thoku region. It is long and drains an area of . It flows through mostly rural areas of Iwate and Miyagi Prefectures. The source of the river is the Mount Nanashiruge in northern Iwate, from which it flows to the south between the Kitakami Mountains and the Ou Mountains. The river is unusual in that it has two mouths, one flowing south into Ishinomaki Bay and the other flowing east into the Pacific Ocean, both in Ishinomaki City.  - Japan ("Nippon" or "Nihon" ; formally "" or "Nihon-koku", means "State of Japan") is a sovereign island nation in Eastern Asia. Located in the Pacific Ocean, It is lying off the eastern coast of the Asia Mainland (east of China, Korea, Russia) and stretching from the Sea of Okhotsk in the north to the East China Sea and near Taiwan in the southwest.   - Asia is Earth's largest and most populous continent, located primarily in the eastern and northern hemispheres and sharing the continental landmass of Eurasia with the continent of Europe. Asia covers an area of , about 30% of Earth's total land area and 8.7% of the Earth's total surface area. The continent, which has long been home to the majority of the human population, was the site of many of the first civilizations. Asia is notable for not only its overall large size and population, but also dense and large settlements as well as vast barely populated regions within the continent of 4.4 billion people.  - The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south and is bounded by Asia and Australia in the west and the Americas in the east.  - China, officially the People's Republic of China (PRC), is a unitary sovereign state in East Asia. With a population of over 1.381 billion, it is the world's most populous country. The state is governed by the Communist Party of China, and its capital is Beijing. It exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities (Beijing, Tianjin, Shanghai, and Chongqing), and two mostly self-governing special administrative regions (Hong Kong and Macau), and claims sovereignty over Taiwan. The country's major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a great power and a major regional power within Asia, and has been characterized as a potential superpower.  - In the quinquennial census of 2010, the city had a population of 23,302 (2005: 24,709) and a population density of 100 persons per km. The 2011 Thoku earthquake and tsunami caused extensive damage to the city, and as of February 2014, the city had an estimated population of 19,449 and a population density of 83.7 persons per km. The total area was 1,259.89  km.  - Name. There are several theories about the origin of the name "Iwate", but the most well known is the tale "Oni no tegata", which is associated with the Mitsuishi or "Three Rocks" Shrine in Morioka. These rocks are said to have been thrown down into Morioka by an eruption of Mt. Iwate. According to the legend, there was once a devil who often tormented and harassed the local people. When the people prayed to the spirits of Mitsuishi for protection, the devil was immediately shackled to these rocks and forced to make a promise never to trouble the people again. As a seal of his oath the devil made a handprint on one of the rocks, thus giving rise to the name Iwate, literally "rock hand". Even now after a rainfall it is said that the devil's hand print can still be seen there.  - Population density (in agriculture: standing stock and standing crop) is a measurement of population per unit area or unit volume; it is a quantity of type number density. It is frequently applied to living organisms, and most of the time to humans. It is a key geographical term.  - Taiwan, officially the Republic of China (ROC), is a state in East Asia. Neighbors include China (officially the People's Republic of China, abbreviated as PRC) to the west, Japan to the northeast, and the Philippines to the south. Taiwan is the most populous state that is not a member of the United Nations, and the one with the largest economy.  - A population is the number of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.  - Geography. sh is located in the south-central portion of Iwate Prefecture, bordered by the Akita Prefecture to the west. At 993.35 square kilometers, sh is the second largest community in Iwate Prefecture in terms of land area. The city lies in a fertile plain straddling the Kitakami River and rises to the u Mountains in the west and the Kitakami mountains to the east. The city's highest point is Mt. Yakeishi-dake at 1,548 meters in the u Mountains. The northern boundary is marked by the Isawa River while the Koromogawa River marks the southern border. Ishibuchi Dam creates a reservoir on the upper reaches of the Isawa River near Mt. Yakeishi-dake.  - Korea is a historical state in East Asia, since 1945 divided into two distinct sovereign states: North Korea (officially the "Democratic People's Republic of Korea") and South Korea (officially the "Republic of Korea"). Located on the Korean Peninsula, Korea is bordered by China to the northwest and Russia to the northeast. It is separated from Japan to the east by the Korea Strait and the East Sea.  - The are a mountain range in the Thoku region of Honsh, Japan. The range is the longest range in Japan and stretch south from the Natsudomari Peninsula of Aomori Prefecture to the Nasu volcanoes at the northern boundary of the Kant region. Though long, the range is only about wide. The highest point in the range is Mount Iwate, .  - The Sea of Okhotsk is a marginal sea of the western Pacific Ocean, lying between the Kamchatka Peninsula on the east, the Kuril Islands on the southeast, the island of Hokkaido to the south, the island of Sakhalin along the west, and a long stretch of eastern Siberian coast (the Shantar Sea) along the west and north. The northeast corner is the Shelikhov Gulf. The sea is named after Okhotsk, the first Russian settlement in the Far East.  - Russia (from the  Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140 million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara.  - History. The area of Akita has been created from the ancient provinces of Dewa and Mutsu.  - National Route 343 is a national highway of Japan connecting Rikuzentakata , Iwate and sh , Iwate in Japan , with a total length of 65.1 km ( 40.45 mi ) .    What entity does 'japan national route 343' has the relation 'located in the administrative territorial entity' with?
Answer:
iwate prefecture