Los Angeles is one of the most biodiverse regions on Earth, with an incredible range of ecosystems and microclimates that vary widely across LA County. This diversity supports a rich array of plants, animals, and natural landscapes. Explore this website to discover the unique topography, geology, and wildlife that shape these ecosystems—from Chaparral to Coastal Sage Scrub to Riparian Woodland. Learn why each part of an ecosystem is essential to the health, resilience, and quality of life in the region.