Question: Carnaby Street is a radio programme whose broadcast covers a firth that comprises part of what?
Sentence (from "Solway Firth"): The Solway Firth (Scottish Gaelic: "Tràchd Romhra" ) is a firth that forms part of the border between England and Scotland, between Cumbria (including the Solway Plain) and Dumfries and Galloway.
Relevant evidence: Yes