Here's the official website with some explanation:
Northumberlandia is a unique piece of public art set in a 19-hectare community park providing free public access, with four miles of footpaths on and around the landform, along with a café and visitor centre. ...
The centrepiece of this 19-hectare park is ‘The Lady of the North’, a stunning human landform sculpture of a reclining lady. Made of 1.5 million tonnes of rock, clay and soil, she is 100 feet high and a quarter of a mile long.
Interesting that the Wikipedia entry says it was designed to be a “major tourist attraction.” I live in the north of England and this is the first time I’ve ever heard of it(!)
Northumberlandia is a unique piece of public art set in a 19-hectare community park providing free public access, with four miles of footpaths on and around the landform, along with a café and visitor centre. ... The centrepiece of this 19-hectare park is ‘The Lady of the North’, a stunning human landform sculpture of a reclining lady. Made of 1.5 million tonnes of rock, clay and soil, she is 100 feet high and a quarter of a mile long.
https://thelandtrust.org.uk/space/northumberlandia/