 a sky island perched on top of a mountain surrounded on all sides by lowland. And scientists have now found dozens of new species living there. Our environment correspondent, Jonah Fisher, has just come back from the latest expedition. Welcome to Eden. Welcome to the centre of Marble Forest. This is about as good as it gets. There are still places on Earth that humans have hardly touched. The forest is in excellent condition. The water is crystal clear, beautiful for drinking and washing.