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 all forms of walking, whether it is a walk in the park or trekking in the Alps. Hiking is used in the UK, but less often than walking. Within the UK walking is sometimes called rambling, and the main organisation that supports walking is 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.