Green Island (Dorset) Green Island (Dorset) Green Island is an island in Poole Harbour in the English county of Dorset. It lies in the central south part of the harbour, south of Brownsea Island and Furzey Island. The island is an Area of Outstanding Natural Beauty (AONB), Site of Special Scientific Interest (SSSI) and Special Protection Area (SPA). The island covers approximately at low tide while the central raised part of the island is approximately . The island is covered in extensive woodland in the centre, made up of Scots pine with several small zones of heathland. The island also has a large
Brownsea Castle another device in 1544 to further improve the country's defences, particularly along the south coast. The castle was built on the south-east corner of Brownsea Island between 1545 and 1547 to protect the entrance of the busy Poole Harbour. The island belonged to the Crown, having been confiscated from Cerne Abbey during the Dissolution of the Monasteries a few years before. It was a conservative design, being a one-storey, square blockhouse, reported in 1552 to be across, able to support guns on its roof and sub-divided into three rooms; the blockhouse was originally intended to have been two storeys in