Furzey Island theorized that Green Island was a centre of production that exported its goods to continental Europe. This theory lends further evidence to Green Island having once been an important port. Furzey Island Furzey Island is an island in Poole Harbour in the English county of Dorset. The island lies to the south of the larger Brownsea Island. Seen from the water, or adjoining land, the island looks like another wild pineclad island. However, hidden in the trees are twenty-two oil wells split into 2 well-sites for the Wytch Farm Oil Field, which is linked by pipeline to Hamble on Southampton
Brownsea Island island has a heronry, in which both grey heron and little egret nest. There is a large population of non-native sika deer on the island. In the past the numbers have been higher than the island can sustain and have overgrazed. To try to limit damage to trees and other vegetation by deer, areas of the island have been fenced off to provide areas of undamaged woodland to allow other species such as red squirrels to thrive. The lagoon is noted for the large population of common tern and sandwich tern in summer, and a very large flock of avocets