a system of hills in England that extend from the Scottish border in the north to the Trent River in the south; forms the watershed for English rivers

The Pennines are a mountain range in England. Often said to be the "backbone of England", they form an unbroken range stretching from the Peak District in the Midlands, through the Yorkshire Dales, parts of Greater Manchester, the West Pennine Moors of Lancashire and Cumbrian Fells to the Cheviot Hills on the Scottish border. Their total length is about 250 miles (400 km).