Walking is one of the most popular outdoor recreational activities in the United Kingdom, and within England and Wales there is a comprehensive network of rights of way that permits easy access to the countryside. Access is also easy in Scotland but not in Northern Ireland. Walking is used in the United Kingdom to describe a range of activity, from a walk in the park to trekking in the Alps. The word "hiking" is used in the UK, but less often than walking; the word rambling is also used, and the main organisation that supports walking is called The Ramblers. Walking in mountainous areas in the UK is called hillwalking, or in Northern England, including the Lake District and Yorkshire Dales, fellwalking, from the dialect word fell, for high, uncultivated land. Mountain walking can sometimes involve scrambling.