Arakawa, Tokyo Arakawa, Tokyo Arakawa has sister-city relationships with Donaustadt in Vienna, Austria, and with Corvallis, Oregon, U.S. Domestically, it has similar relationships with nine cities, towns and villages. As of May 1, 2015, the ward has an estimated population of 208,763, and a population density of about 20,550 persons per km². The total area is 10.16 km². Arakawa is in the northeastern part of Tokyo. The shape is long and narrow, stretching from west to east. The Sumida River forms the northern boundary. The ward is surrounded by five other special wards. To the north lies Adachi; to the west, Kita;
Japanese gunboat Sumida (1903) the Allies. "Sumida" saw combat service in the Second Sino-Japanese War, beginning with the First Shanghai Incident in 1931. "Sumida" continued to operate on the Yangtze River in China during the early 1930s, but was already considered obsolete, and was struck from the navy list on March 1, 1935. She was scrapped on March 31, 1935 at Shanghai. Japanese gunboat Sumida (1903) "Sumida" was the first gunboat in the Imperial Japanese Navy inventory designed specifically for inland river service. The need for such a vessel to operate on the rivers of the Asian mainland to protect Japanese commercial interests at