Queen Elizabeth II Fields is his diamond jubilee tribute to the Queen. The prince hopes to ensure that people across the country have access to outdoor recreational spaces for sport and play.
The prince called the challenge "ambitious" and said: "The year 2012 marks the Queen's diamond jubilee and I cannot think of a more fitting tribute to my grandmother's 60 glorious years on the throne.
"The sad truth is that over the years thousands of playing fields have been lost to development, and many more are under threat today. For more than 80 years the Fields in Trust charity has worked hard to protect playing fields from development. There has never been greater need for their work."
Fields in Trust chief executive Alison Moore-Gwyn said: "The 1,271 playing fields we currently protect across the UK are often the green heart of the local area."