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) 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 , with a normal displacement of 338 tons and draft of . She was propelled by two Kampon steam turbine engines with two boilers driving two shafts, producing and had a top speed of 17 knots. The ship was armed with one /28 cal. gun and one 25mm machine gun. " Sumida" was laid down on 13 April 1939 and launched 30 October