The 'Burren' is a huge limestone area in the green fields of County Clare.  The word is derived from the Gaelic bhoireann meaning a 'barren stony place', and it has often been described as a limestone desert.  But while appearing bare and lifeless from a distance, it is a locality that is unbelievably productive and rich in flora.  The ice ages forced arctic and alpine plants far southward where they reached this area and have remained, while the warm waters of the Gulf Stream flowing up the west coast of Ireland encouraged the growth of more southerly Mediterranean plants, so that this is the only place in Europe where many of these species exist side by side.