Yambol or Jambol (both: yämˈbôl) [key], city (1993 pop. 91,119), SE Bulgaria. It is a commercial center and produces textiles, machinery, ceramics, and furniture. There are mineral springs nearby. The city was known in Roman times. Yambol was a residence of Turkish beys from the 15th to 18th cent. There are an 18th-century church and several Turkish mosques.