The Pennines /ˈpɛnaɪnz/, also known as the Pennine Chain or Pennine Hills, are a range of mountains and hills in Northern England separating North West England from Yorkshire and North East England.
Often described as the "backbone of England", the Pennine Hills form a more-or-less continuous range stretching northwards from the Peak District in the north Midlands, into the South Pennines incorporating parts of Lancashire, Yorkshire and Greater Manchester, through the Yorkshire Dales and North Pennines past the Cumbrian Fells up to the Tyne Gap, which separates the range from the Cheviot Hills. North of the Aire Gap, the Pennines' western spur into North Lancashire forms the Bowland Fells which are also considered separate from the Pennines, and south of the gap is a spur into east Lancashire, comprising the Rossendale Fells and West Pennine Moors. The Pennines are an important water catchment area with numerous reservoirs in the head streams of the river valleys.