At the top of the Miyar Valley in the high Himalayas, a chain of seven tiny turquoise pools nestle below the snout of a formidable glacier. Each one looks deceptively inviting. We plunge in and our shouts, as we brave the icy water, echo off walls of rock into empty air; there is no one but our group around to hear. For miles in every direction there are only mountains; their white peaks, sheer slopes and pockets of high hidden valleys are filled with wild flowers for just a few months of the year, mainly June and July, when their cape of snow melts away.

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Most stunning are the fragile, brilliant blue Himalayan poppies, which inspire such devotion that there is a book, Blue Heaven, dedicated to them. Some are scattered among the rocks around the pools, above the grassy meadows which feel like our own private heaven. We rest here for a day to acclimatise before heading up on to and across the glacier, playing cricket at nearly 4,000m and reading in the sunshine. Mobile phone reception had petered out beyond the last village several days earlier, so even the most anxious have gradually settled into the rhythm of unconnected days, blissfully cut off from the rest of the world.

Facebook Twitter Pinterest On the slopes … the trek begins

In the week after leaving the highest village in the long Miyar Valley, we see yaks and horses roaming half-wild, and marshy lakes filled with migrating birds, a joyful patchwork of red, pink, white, yellow and blue flowers,but fewer than a dozen other people. Most are nomad shepherds who spend the summer guiding their flocks to seasonal grazing grounds along ancient paths invisible to the uninitiated, dotted with tiny stone huts that provide shelter from the elements.

For those who want to see the high Himalayas, but are wary of their steepest passes, the Miyar Valley makes a great trip

In 1933 the British author James Hilton coined the term Shangri-La to describe a secluded Buddhist mountain utopia. The word, and the dream it represented, escaped the pages of his novel Lost Horizon and became embedded in popular culture, idealised, constantly reinterpreted and appropriated for the name of everything from a chain of luxury hotels to the most offbeat area of the Glastonbury festival. Few of them bear much resemblance to the rural idyll Hilton describes. In the Miyar Valley though, Hilton might have recognised something like his forgotten, isolated paradise.

Police in Urgos, the last sizeable village before the wilderness unfurls towards the highest peaks, must record every visitor to the valley. There are so few that years of names and personal details are stored in a single register, each painstakingly written out longhand by the officer, rarely more than 200 each season.

Facebook Twitter Pinterest Blue waters … swimming in the rock pools

A simple visitor centre can help arrange “homestays” in the village, or for you to pitch tents for a first night of camping on the village cricket pitch, beside a fast-rushing stream andoverlooking the roofs of a historic Buddhist temple. If you can find the custodian, he will unlock it (in return for a small donation to the temple offering boxes), so you can pad around barefoot to inspect a storehouse of sacred scrolls and gilded statues that gleam in the light of yak butter lamps. On the ridge of a hillside above, prayer flags flutter along the path to another shrine.

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We set off on our trek early the next morning through pine forests with a soft, fragrant carpet of cones and fallen pine needles, tracing field boundaries beside the raging torrent of the Miyar River and its tributaries. There were some bridges, but twice we crossed the old way, in iron baskets suspended from a wire, hauled back and forth by fellow travellers. They sway from wind and movement as you inch over freezing water, stirring up fear and exhilaration like a good rollercoaster.

By that evening we had left civilisation behind, setting up our first campsite on the edge of the wilderness. We were not roughing it. It might not be “glamping” as recognised by anyone who likes to commune with nature accessorised with fresh sheets and deep baths, but to me it seemed as close as you could get deep in a pristine Himalayan valley at 3,000m.

Facebook Twitter Pinterest Peak practice … a midday rest with a spectacular view of a glacier

A talented, inventive cook conjured up hot breakfasts, feasts every evening – including a birthday cake somehow cooked on a camping stove – and a spread for daily picnic lunches. Hot tea brought to each tent was the daily alarm clock, and we often arrived at the evening’s campsite to find tents pitched, freshly cooked snacks and bowls of warm water for washing.

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There was extra padding for sleeping mats, a lantern for evenings playing cards or planning the next day’s route, and even a toilet tent. While the beauty and solitude felt like the ultimate luxury, travelling with a local, family-run trek company meant that the trip was very reasonable, and with nowhere to spend money in the mountains, there was no chance of going over budget. After our day by the seven pools, we were meant to continue on over a pass of about 5,100m, and down through another flower-filled valley, but when one member of our group started developing severe altitude sickness we decided to return instead.

There was an option for some guides and trekkers to continue, but we preferred to stay together. It felt like a small sacrifice, the vistas on our return looking different but equally stunning, Urgos and its temple still charming.

Facebook Twitter Pinterest Free roaming … horses gallop on their summer grazing grounds

For visitors who want to see the high Himalayas, but might be wary of their steepest passes, the Miyar Valley makes a great trip. It’s relatively accessible for novice trekkers because it is unusually long and relatively flat (one of our group was 73 years old), but can also be the start of a much longer, more demanding trek. If you continue up the glacier, you reach the Kang-La pass, which leads down to the fabled Tibetan kingdom of Zanskar. Or you can cross the glacier at its snout, head over another high pass in the shadow of Menthosa, the nearly 6,500m peak that was first climbed only in 1970. Yet despite the history, the mountains, the tranquillity, the culture and the ease of access to higher meadows, the Miyar Valley is almost as unvisited as the original, mythical Shangri-La. This paradise for visitors – locals are ambivalent about their isolation, not least because almost all the young people leave to look for work in towns – will not last.

The reason for the tranquillity, and the price visitors must pay to escape there, is a relatively long journey by air, train or road to the valley and back. From the Indian capital Delhi you fly to Manali, once a sleepy hill town, now the epicentre of the local trekking and tourism industry. A day of driving follows, up and over the 4,000m Rohtang pass, a hair-raising journey of bends and ice even in high summer. For centuries, perhaps millennia, it has been a vital transport artery, linking the Lahaul valley to the world beyond.

Facebook Twitter Pinterest High camp … an evening under canvas

That role is coming to an end now though, after the Indian government drilled through the mountains to build the all-weather Rohtang tunnel, that will tie Lahaul more closely to the rest of the country and, as a side-effect, open up tourism in Urgos.

It will still be relatively remote, but the tunnel – due to open next year – will make it feasible to get from Delhi to the edge of the Miyar within a (very long) day. More tourists will certainly follow; try to visit before they do.

Way to go

Emirates flies from Heathrow to Delhi from £439. Trek with Zingaro Travels, from £70pp a day – food, guides and tents included – around Manali; email info@zingarotreks.com). For information on homestays, local walks, guides and cultural festivals in Urgos, contact the visitor centre at miyartourism@gmail.com

Best of the rest, from Zingaro Travels

Trekking for families: Gada Gushaini

A five-day trek in the foothills, through forest, fields and villages as well as a long ridge walk with views of distant peaks.

For the adventurous: Bara Bangahal

A fortnight-long trek across two passes over 4,700m and some tricky river crossings, through a remote village on the upper Ravi River occupied by farming families who migrate up from winter homes for the warmer months.

For the spiritual: Zanskar

A slice of Tibetan Buddhist life and heritage, this trek starts in Urgos. There are several routes over high passes into starkly beautiful valleys, dotted with hillside monasteries.

Homestays in Urgos Fobrong Homestay, Menthosa Homestay, Amarnath Homestay. These vary in terms of facilities and location.

Looking for walking holiday inspiration? Browse The Guardian’s selection of walking holidays on the Guardian Holidays website