The largest park in London. Richmond Park is a 2,360 acre park within London. It is the largest of the Royal Parks in London and Britain's second largest urban walled park after Sutton Park, Birmingham. The park is famous for its red and fallow deer, which number over six hundred. It is so big, you can't see everything in one day. So we decided to try the route suggested by the Walks in London book by Rough Guides which I recently bought.