Sentence:  A low-lying, marshy enclave stretching eighteen miles along the coast and pushing some eight to ten miles inland, the <WSD>Pale</WSD> of Calais nestled between French Picardy to the west and, to the east, the imperial-dominated territories of Flanders. 
Meaning of the word marked with <WSD> tags:  The territory around (Calais) under English control (from the 14th to 16th centuries).