is a town located in Miyagi Prefecture, Japan. , the town had an estimated population of 6,319, and a population density of 97 persons per km2 in 3,110 households. The total area of the town is . Geography Onagawa is located on the rugged Sanriku Coast of north-central Miyagi Prefecture, with the Kitakami Mountains to the west and the city of Ishinomaki to the east, south and north. Much of the town is within the borders of the Sanriku Fukkō National Park. Onagawa is a natural deep water port, located at the intersection of two major ocean currents and noted for its commercial fishing industry. Located nearby on the southern side of Onagawa Bay is the Onagawa Nuclear Power Plant. Neighboring municipalities Miyagi Prefecture Ishinomaki Climate Onagawa has a humid climate (Köppen climate classification Cfa) characterized by mild summers and cold winters with heavy snowfall. The average annual temperature in Onagawa is 11.1 °C. The average annual rainfall is 1213 mm with September as the wettest month. The temperatures are highest on average in August, at around 23.6 °C, and lowest in January, at around -0.1 °C. Demographics Per Japanese census data, the population of Onagawa has declined rapidly over the past 60 years. History The area of present-day Onagawa was part of ancient Mutsu Province, and has been settled since at least the Jōmon period by the Emishi people. During later portion of the Heian period, the area was ruled by the Northern Fujiwara. During the Sengoku period, the area was contested by various samurai clans before the area came under the control of the Date clan of Sendai Domain during the Edo period, under the Tokugawa shogunate. The village of Onagawa was established on 1 June 1889 with the establishment of the modern municipalities system. The port of Onagawa, with its deep and sheltered harbor, has long been important both commercially and militarily. The port was hit by an air raid on 9 August 1945, which sank several ships during the closing days of World War II. A memorial to Canadian Royal Navy Fleet Air Arm pilot Robert Hampton Gray who died in the attack, was unveiled in the town in 1989. Onagawa was raised to town status on 1 April 1956. 2011 earthquake and tsunami Onagawa was one of the most heavily damaged communities by the 11 March 2011 Tōhoku earthquake and tsunami. The tsunami reached in