Ymittos is a mountain range located in the eastern part of the Athens metropolitan area in Attica, Greece. It runs close to the urban fabric of Athens and forms one of the most important natural landmarks of the region.

The mountain is known for its rocky terrain, pine-covered slopes, and historical monasteries scattered across its landscape. It is an important ecological zone with protected flora and fauna, as well as numerous hiking trails and viewpoints overlooking Athens and the Saronic Gulf.

Today, Ymittos serves as a major green lung for the city of Athens, offering residents and visitors opportunities for hiking, nature exploration, and outdoor recreation. Its proximity to dense urban areas makes it a vital natural escape within the metropolitan environment.