Saitama (city) city boundaries. The western portion of the city lies on the lowland created by the Arakawa River along with those created by small rivers such as the Moto-Arakawa River, Shiba River, and Ayase River. The rest of the area mostly resides on the Ōmiya Plateau lying in the north-south direction. Dispersed in this region, major rivers flow southward, almost paralleling to one another. Saitama has ten wards ("ku"), which were assigned official colours as of April 2005: Saitama's economy is principally constituted by commercial business. The city is one of many commercial centers of the Greater Tokyo area and serves
Japanese gunboat Sumida (1939) commissioned into the Republic of China Navy as the "Chiang Hsi" (). She was removed from the Japanese navy list on 3 May 1947. Captured during the Chinese Civil War by the People’s Republic of China, she was commissioned into the People's Liberation Army Navy on 30 November 1949 as the gunboat "Fu Jiang" (). She was finally scrapped in the 1960s. Japanese gunboat Sumida (1939) "Sumida" was the second of two vessels in the river gunboats authorized under the 3rd Naval Armaments Supplement Programme of 1937. "Sumida" had a hull with an overall length of and width of ,