What is the fine-grained topic of the following text: Headquartered in Shanghai, SMIC has a 300mm wafer fabrication facility and three 200mm wafer fabs in its Shanghai mega-fab, two 300mm wafer fabs in its Beijing mega-fab, a 200mm wafer fab in Tianjin, and a 200mm fab under construction in Shenzhen. Only return the topic.
SMIC's wafer fabrication facilities in China