Lancashire stretches from the Irish Sea in the west to the [[Pennine Hills]] in the east and the fells of the southern Lake District in the north. It is bound to the north-west by [[Cumberland]], to the north by [[Westmorland]], to the east by [[Yorkshire]], with which it shares far its longest land border, formed by the Pennines, and the border with Cheshire to the south is demarcated by the [[River Mersey]].
=== Hundreds ===
=== Hundreds ===
[[File:Lancashire Hundreds.jpg|left|250px|thumb|A map of the Hundreds of Lancashire.]]
[[File:Lancashire Hundreds.jpg|left|250px|thumb|A map of the Hundreds of Lancashire.]]