Sanjay Gandhi National Park

Listen for a moment. Behind the hum of traffic, there is another layer of sound — the dry rustle of teak leaves, a sharp bird call, the distant chatter of monkeys moving through the canopy. The air feels a little cooler here, and it smells of damp earth and leaf litter. You are standing at the edge of a forest that sits inside one of the most crowded urban regions on Earth. That contrast is the whole story of this place.

Sanjay Gandhi National Park covers a large green wedge of hills and valleys in the northern part of Mumbai. Its boundary runs close to Borivali, Thane, and the neighbourhoods around Mira-Bhayandar. On a map, it looks almost impossible. Dense apartment towers press against the forest on several sides. Yet inside, the city disappears. Hills rise covered in mixed deciduous forest, and seasonal streams cut through the rock below.

The park was not always known by this name. For many years it was called Borivali National Park, after the suburb at its main gate. In the early 1980s it was renamed in memory of Sanjay Gandhi, the politician and son of Prime Minister Indira Gandhi. Many older residents still use the earlier name. You may hear both when you ask for directions.

Here is something many visitors do not expect. This forest is home to wild leopards. Researchers who study these animals consider this one of the most remarkable leopard populations in the world, because the cats live so close to millions of people. Camera traps record them moving along forest paths at night. Some leopards walk to the edge of housing colonies, then return to the hills before dawn. You are very unlikely to see one by day — but they are here, and they know this landscape well.

The forest also carries something much older than any leopard. Deep inside the park, carved into a basalt hillside, are the Kanheri Caves. Basalt is the dark volcanic rock that forms much of western India. Buddhist monks cut these caves by hand over many centuries, starting roughly two thousand years ago. There are more than a hundred of them. Some are simple cells for meditation. Others are large halls with carved pillars and figures of the Buddha.

Think about what that means. Long before Mumbai became a city, this hillside was a working monastery and a place of learning. Monks lived here through the monsoon seasons. Archaeologists and historians have studied inscriptions on the cave walls, which record donations from traders and local supporters. The caves show that this coast was connected to wide networks of trade and religion. The road you travel to reach them follows a route that pilgrims used for generations.

As you walk through the caves, notice the small engineering details. Channels cut into the rock guided rainwater into stone cisterns. Those tanks gave the monks water through the dry months. Stone benches line some of the cells, worn smooth by centuries of use. In the larger halls, look up. The ceilings were shaped to imitate timber beams, a reminder that earlier buildings in this tradition were made of wood.

Water remains central to this forest today. Two lakes inside the park, Vihar and Tulsi, are part of Mumbai's water supply. They were created by dams during the British period, when the growing city needed reliable drinking water. So the forest is not only a refuge for wildlife. It protects the catchment that feeds homes across the city. When you see the surface of a lake here, you are looking at part of Mumbai's daily life.

The living forest changes sharply with the seasons. During the monsoon, which usually arrives in June, the hills turn deep green almost overnight. Waterfalls appear on the rock faces, and the streams run fast and brown. By the dry months, many trees drop their leaves, and the forest floor turns gold and crisp underfoot. The same trail can feel like two different places, depending on the month you visit.

Keep your eyes open for smaller residents. Spotted deer graze in open patches near the main road. Bonnet macaques and grey langurs move through the trees, and they are bold around food. The park is also rich in birds, butterflies, and reptiles. Early in the morning, birdwatchers gather with binoculars along the quieter paths. Many come for kingfishers, hornbills, and the many small songbirds that call from the undergrowth.

The park also has a human side that visitors often miss. Indigenous communities, including Warli and other Adivasi groups, have lived in hamlets around and inside this forest for a very long time. Adivasi is the term used in India for its tribal and indigenous peoples. Their villages, farming, and knowledge of the forest are part of this landscape. Their presence raises real questions about how a city protects nature while respecting the people who have always lived with it.

For families, the area near the main gate is the busiest part of the park. You will find a small toy train that loops through the trees, boating on a lake, and organised safari areas. Further in, the atmosphere becomes calmer. Cyclists climb the road toward Kanheri on weekend mornings. Walkers follow guided nature trails with forest staff. The deeper you go, the more the city noise fades into birdsong.

Now, take a moment where you stand. Look at the trees around you and the hills behind them. Somewhere in that forest, a leopard is resting in the shade, waiting for evening. Somewhere on that hillside, stone cells carved by monks are still holding the cool air. And just beyond the boundary, the city keeps moving. As you walk away, listen for the moment the birdsong gives way to traffic — and remember how close these two worlds really are.