King Offa's Oak is a pollarded pedunculate oak which grows on the territory of Windsor Great Park, Berkshire, England. As measured in 1998, the tree was 11.18 metres (36.7 ft) in girth, and the trunk splits 1 metre above ground, leaving several large offshoots. In 2017, the height was measured as 16.5 metres (54 ft). The oak is at least 1300 years old according to experts and potentially as old as 1500 years. Both of these numbers would make the tree the oldest oak in the United Kingdom.