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In page Wirral Peninsula:

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Although it has been stated that "it is difficult to find any work in which there is a written description of the exact area defining the Wirral Peninsula",[1] historian Stephen Roberts defines it as "the peninsula which is bounded by the Dee and Mersey estuaries, Irish Sea and... the route of the Shropshire Union Canal between Ellesmere Port and Chester". This definition extends the original hundred slightly further east, to the River Gowy.[2]