Sentence:  So "Segrave" in "Leiceſterſhire" (which Towne I am now bound to remember) is ſited in a <WSD>Champain</WSD>, at the edge of the Wolds, and more barren than the villages about it, yet no place likely yeelds a better aire. 
Meaning of the word marked with <WSD> tags:  Open countryside, or an area of open countryside.