Tabur Hill is a magnificent limestone ridge at Taman Melawati in Kuala Lumpur. It may possibly be the longest crystal quartz outcrop in the world, a geological wonder right next to the city. The ridge supports a type of heath forest, characterised by dry vegetation and plants that have adapted to growing on steep and harsh terrain. Climbing up the hill, visitors can see 250 species of small coniferous-like trees, shrubs, creepers, orchids and moss, including five endemic species of plants. Contained within much of the limestone are beautiful (but commercially worthless) quartz crystals, many of which have been chipped off by visitors at exposed areas. Running in a semi-circle at more than 14 km long and 200 meters wide, the most prominent section is the middle 5 km span that lies behind Taman Melawati all the way to the National Zoo.