St. Anne’s Park is the second largest public park in Dublin. It covers just over 240 acres and is a very popular place for city dwellers to stretch their legs and walk their dogs.
The park contains many interesting features, including a walled garden, the grand avenue and twelve follies. In the last few decades, a rose garden, walking trails and the Millennium Arboretum have been added, which contain over 1000 varied trees.
The loop trail at St. Anne’s is a highly recommended walk. To the best of my knowledge it is about 6km long.