Xinji (China) is 8 times larger than Suleja.
Area: 119 km2 calculated
Suleja is a city in Niger State, Nigeria, pop. local government area, 216,578, just north of Abuja, capital of the Suleja Emirate. Wikipedia
Area: 956 km2 calculated
Xinji is city of Hebei province in northern China. There are 8 townships and 7 rural districts under the administration of Xinji. Wikipedia