North Harris contains Clisham (799m), the highest peak in the Outer Hebrides. Steep-sided glens, with precipitous crags, have a mountainous character. Exposure and grazing prevent tree growth. Deep sea lochs in the east penetrate far into the hills. The east coast of Harris has many bays and islets. The west coast has wide, sandy beaches with machair. Rocky headlands, separating the bays, have been sculptured into geos and stacks. Scattered islands lies in the Sound of Harris between South Harris and North Uist.