The island of Saint Helena is in area, and is composed largely of rugged terrain of volcanic origin (the last volcanic eruptions occurred about 7 million years ago). Coastal areas are covered in volcanic rock and are warmer and drier than the centre. The highest point of the island is Diana's Peak at . In 1996 it became the island's first national park. Much of the island is covered by New Zealand flax, a legacy of former industry, but there are some original trees augmented by plantations, including those of the Millennium Forest project, which was established in 2002 to replant part of the lost Great Wood and is now managed by the Saint Helena National Trust. The Millennium Forest is being planted with indigenous gumwood trees.