Nishiwaki is a city in Hyōgo Prefecture, Japan. As of 1 May 2022, the city had an estimated population of 39,001 in 17210 households and a population density of 290 persons per km2. The total area of the city is 132.44 square kilometres. The city calls itself "The Navel of Japan." Located at the crossing of the 135° East meridian and the 35° North parallel, the city's Nihon no Heso Park marks the center of the nation