Mainland Malaysia and Borneo are two very different peas in a pod; in fact, it’s nigh impossible to resist seeing one without the other. Check our tours for Malaysia and Borneo to discover how holidays here balance livewire cities with island rainforests and sanctuaries striving to protect one of the world’s most endangered (and most loved) primates. Read our travel guide to Malaysia and Borneo to discover how holidays here balance livewire cities with island rainforests and sanctuaries striving to protect one of the world’s most endangered (and most loved) primates. Borneo is the planet’s third-largest island (after Greenland and New Guinea). More than 15,000 species of plants live in the 130-million-year-old rainforests. Hundreds of mammals including both orangutans and proboscis monkeys thrive in the dense jungles. Add dozens of tropical islands, thousands of kilometres of beaches and Malaysia’s tallest mountain.