Southport, Merseyside, UK 12th October, 2015. Silhouette man. UK Weather. Colourful sunset over the Irish Sea and Ainsdale Sand Dunes National Nature Reserve (NNR), which is a 508-hectare site comprising rare dunes, beach and woodland habitats. There are 10 kms of way-marked footpaths to follow, a tranquil and wild place surrounded by one of the most urban areas in England.