Changes

== Definition==

== Definition==

The Pennine chain stretches approximately between valleys the River Trent in the south and the River Tyne in the north, where the "Tyne Gap" separates the range from the [[Cheviot Hills]].

The Pennine chain stretches approximately between valleys the River Trent in the south and the River Tyne in the north, where the "Tyne Gap" separates the range from the [[Cheviot Hills]]. In the east, the part of the range containing the Yorkshire Dales is bound by the Vale of Mowbray, a plain separating them from the [[North York Moors]]. The range is bound in the north-west by the valleys of the River Eden and River Lune, both of which partially form a natural boundary with the [[Lake District]].

Occasionally, the Cheviot Hills, which straddle the border between England and Scotland, are included in more broad definitions of the range. However, they are of mainly [[Igneous rock|igneous]] origin, making them geologically distinct from the largely limestone (sedimentary) rocks of the Pennines.

Occasionally, the Cheviot Hills, which straddle the border between England and Scotland, are included in more broad definitions of the range. However, they are of mainly [[Igneous rock|igneous]] origin, making them geologically distinct from the largely limestone (sedimentary) rocks of the Pennines.