– Predominantly limited to Tresco though with some area also in northern St Mary’s.
– Low granite mounds with broad plateaux tops.
– Plateaux tops clothed in dense plantations of mixed woodland, much of it under repair following extensive storm damage during the 1990’s.
– Woodlands provide shelter and salt filter for the sub-tropical Tresco Abbey Gardens.
– Hill-slopes of Middle Down on Tresco are in mixed agricultural use.