As of 31 July, 2011, the city has an estimated population of 131,706 with 67,308 households and a population density of 541.71 persons per km². The total area is 243.13 km2. Although it is the largest city in Shiribeshi Subprefecture, the subprefecture's capital is the more centrally located Kutchan.
The city was an Ainu habitation, and the name "Otaru" is recognised as being of Ainu origin, possibly meaning "River running through the sandy beach". The very small remaining part of the Temiya Cave contains carvings from the Zoku-Jōmon period of Ainu history, around A.D. 400. Otaru was recognised as a village by the bakufu in 1865, and in 1880 the first railway line in Hokkaido was opened with daily service between Otaru and Sapporo.
An Imperial decree in July 1899 established Otaru as an open port for trading with the United States and the United Kingdom.
The city flourished well as the financial and business center in Hokkaido as well as the trade port with Japanese ruled southern Sakhalin until the 1920s. Otaru was redesignated as a city on August 1, 1922.
On December 26, 1924, a freight train loaded with 600 cases of dynamite exploded in Temiya Station, damaging the warehouse, the harbour facilities and the surrounding area. Local officials stated that at least 94 were killed and 200 injured in this disaster.
Since the 1950s, as the coal industry around the city went into a decline, the status of economic hub shifted from Otaru to Sapporo.
Otaru is a port town on the coast of the Sea of Japan in northern Shiribeshi Subprefecture. The southern portion of the city is characterized by the steep slopes of various mountains (notably Tenguyama), where the altitude of the land sharply drops from the mountains to the sea. The land available between the coast and mountains has been almost completely developed, and the developed part of the city on the mountain slopes is called Saka-no-machi, or "Hill town", including hills named Funamizaka (Boat-view Hill) and Jigokuzaka (Hell Hill).
Some of the rivers in Otaru are: Hoshioki, Kiraichi, Zenibako, Hariusu, Asari, Katsunai, Shioya, Myoken, Irifune.
In the summer the weather, like all of western Hokkaido, is very warm and balmy, with a maximum temperature of around 25 °C (77 °F) and high humidity - not as hot as southern Japan. In the winter, however, Otaru is very snowy, receiving as much as 6.6 metres (260 in) of snow from November to March, when it snows almost constantly and sunshine levels are extremely low. The average maximum snow cover is 1.22 metres (48 in). Extreme temperatures have ranged from 34.9 °C (94.8 °F) on August 1, 2000 to −18.0 °C (−0.4 °F) on January 24, 1954, in which month the highest snowfall of 3.1 metres (122 in) occurred. Monthly precipitation totals in a record dating back to 1943 have ranged from 379.8 millimetres (15.0 in) in August 1962 to 12.0 millimetres (0.5 in) in June 2007.
A canal adorned with Victorian-style street lamps runs through Otaru. The city attracts a large number of Japanese tourists as well as Russian visitors.
A popular attraction on the west side of the city is Nishin Goten (herring mansion). This large wooden building was built in 1897 and was once the house of Fukumatsu Tanaka, a magnate of the herring fishing industry. It was originally built in nearby Tomari village and moved from there in 1958. Visitors can clearly see the difference between the squalid conditions of the first floor sleeping quarters of 120 workers and the ground floor luxury of the magnate’s rooms.
Another notable building is the Sakaushi residence, constructed by Yoshiya Tanoue, a pupil of Frank Lloyd Wright.
The Tomioka Catholic church is also a popular spot. Many of the buildings have been designated as landmark architecture
In the nearby village of Asarigawa Onsen and perched atop of Asari Ski Resort comes a new Boutique Resort catering for outdoor leisure activity. Currently under development by LENKEN, another Wisbey Brothers Build, scheduled for completion in 2018.
Otaru is well known for its beer, and Otaru Beer, next to the canal, is a popular restaurant with a medieval theme. Otaru is also known for the freshness of its sushi. The town also has substantial shopping arcades and bazaars, but fewer than nearby Sapporo.
Otaru's prominent industries are arts and crafts, such as studio glass and musical boxes.
Otaru is an important port for Sapporo, and part of this hilly city is on the lower slopes of Tenguyama, a good place for skiing and other winter sports and one that is accessible via Otaru Tenguyama Ropeway.
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