Question: Where are Luoding and Dingzhou located?
Sentence (from "Dingzhou"): Dingzhou (), formerly Dingxian ( postal: Tingsien) is a county-level city with sub-prefecture-level city status, located under the administration of the prefecture-level city of Baoding in the southwest of Hebei Province in northern China, about halfway between Baoding and Shijiazhuang.
Relevant evidence: Yes