Most of Western Australia has a hot arid and semi-arid climate. However, the south-west corner of the state has a Mediterranean climate. The area was originally heavily forested, including large stands of the karri, one of the world's tallest trees. This agricultural region of Western Australia is in the top nine terrestrial habitats for terrestrial biodiversity, with a higher proportion of endemic species than most other equivalent regions. Due to the offshore Leeuwin Current, the area numbers in the top six regions for marine biodiversity, containing the most southerly coral reefs in the world.