Los Angeles is one of the most biodiverse regions on Earth, home to an extraordinary range of ecosystems and microclimates that stretch across the county’s mountains, valleys, and coastlines. This diversity sustains a rich variety of plants, animals, and landscapes.

Explore this site to discover how topography, geology, and climate shape the ecosystems of Los Angeles – from Chaparral and Coastal Sage Scrub to Riparian Woodland – and how each part of an ecosystem contributes to the region’s health, resilience, and quality of life.