The Cotswolds is a range of hills in central England , sometimes called the `` Heart of England '' , a hilly area reaching over 300 m. The area has been designated as Area of Outstanding Natural Beauty . The Cotswolds are a range of hills in west-central England , sometimes called the `` Heart of England '' , an area 25 m across and 90 m long . The area has been designated as the Cotswold Area of Outstanding Natural Beauty .