The Aravalli mountain range stands as one of the oldest mountain ranges not only in India but on planet Earth. While the Himalayas are young and dynamic, the Aravallis date back more than a billion years. Here are five fascinating facts that reveal why the Aravallis are unlike any other mountain range in the country.
It is over 1.5 billion years old—far older than dinosaurs
The Aravalli mountain range is thought to be over 1.5 billion years old, dating back to the Proterozoic Era, when life forms on Earth were still microscopic. Dinosaurs appeared around 230 million years ago, meaning the Aravallis existed for over a billion years before them. This chain of mountains has survived the assembly and breakup of supercontinents, drastic climate changes, and the evolution of life itself. Walking through the Aravallis today is like stepping into a living geological archive that predates most of what we know about life on Earth.
They were once as tall as the Himalayas
Though it may seem hard to believe now, the Aravalli range once rivaled the Himalayas in height. Over time, natural forces such as erosion, weathering, and a lack of geological activity have caused their steady degradation. While the Himalayas continue to grow due to ongoing tectonic processes, the Aravallis are considered a relict range—the remains of a once-mighty mountain system. Constant erosion has left the present-day Aravallis looking nothing like a typical mountain range.
The range stretches across four states and shapes the landscape
The Aravalli range extends approximately 700 to 800 kilometers, covering Gujarat, Rajasthan, Haryana, and even parts of Delhi. This extensive geographic presence makes it one of the most important natural features of northwest India. Historically, the Aravallis have influenced settlement patterns, trade routes, and climate conditions. In Rajasthan, the range separates the state into the fertile east and the arid west near the desert. In Delhi, traces of the mountain range can be found in rocky ridges.
It acts as a natural barrier against the Thar Desert
One of the vital ecological roles of the Aravalli hills is serving as a natural barrier that curbs the eastward expansion of the Thar Desert. By influencing wind direction and supporting vegetation cover, the range helps reduce desertification in parts of northwest India. However, this barrier is threatened by deforestation, mining, and urbanization, which have degraded the range over time.
Rich in wildlife, history, and hidden travel gems
Despite being ancient, the Aravallis still host diverse wildlife, including leopards, striped hyenas, jackals, and numerous bird species. Protected areas such as Sariska Tiger Reserve and Ranthambore National Park are found within the range, highlighting its importance for nature conservation. Beyond natural significance, the Aravallis hold immense historical value. Various civilizations, Rajput states, and ancient caravan routes once thrived in these mountains, making them a treasure trove for history enthusiasts and travelers alike.
