The Great Himalaya Trail
The Great Himalaya Trail  is a long distance hiking trail which will one day span the entire Greater Himalaya Range from Namche Bawa in Eastern Tibet to Nanga Parbat in Pakistan at the western end. As of June 2011 it has been completed and fully documented in Nepal and Bhutan.
The upper route passes from East to West through established trekking areas of Kanchenjunga to Makalu Barun, Solukhumbu (Everest Region), Rolwaling Himal (Gaurishankar Conservation Area), Helambu, Langtang, Ganesh Himal and Manaslu region, Annapurna, Dolpa, Rara Lake and Humla currently finishing on the border with Tibet at Hilsa.
The trail route was first walked and documented in Autumn 2008 and Spring / Summer of 2009 by Robin Boustead and his team (Pema Tsiring Sherpa, Lakpa Sherpa and Karma Sherpa).
The Government of Nepal is now strongly promoting the trail and its sections as a way of bringing tourism dollars to remote communities. Tourism is the only industry where the consumers come to the producers and so it is a useful tool in poverty alleviation. To make this work, the Great Himalaya Trail is being promoted as a "responsible tourism" destination, and trekkers are being encouraged to be responsible tourists, but using local guides and porters, and local food and accommodation where possible.
Walking the full trail requires excellent logistics and planning. It also requires anywhere between 57 and 160 days to complete depending on route and walking speed. Consequently, most people will walk sections of the trail over different seasons.
It's safe to say that the trekking permit system in Nepal can be confusing. For the popular treks, usually only a single National Park permit plus a TIMS card is necessary.
This is not restricted areas. This is protected areas.
Conservation Areas and National Parks
The divisions of the sections are based roughly along lines of geography, with many areas being a 'himal'. Unlike many popular long distance trails where the route and points along it can be reached by vehicle, many section require a trek in from road head or airport. Choosing a section trek depends on time available, the season and your ability (fitness, skills on ice and snow and ability at atlitude).
Its a 12-day hike in to Kanchenjunga Base Camp. Then it is approximately 20 days to connect with Makalu Base Camp.
12 days hike in to Makalu Base Camp. 7 days to cross to Everest region and a further 3 or 4 to the airport at Lukla.
Flying in from Lukla, approx 25 days to connect to Barabise or The Last Resort on the Kathmandu Lhasa Highway.
Helambu & Langtang
17 days from Barabise to Syabru Besi including the Tilman Pass.
Approx. 18-20 days from Syabru, or Arughat (the traditional start for the Manaslu Trek). Approx 25 days to combine with part of Annapurna circuit to Jomsom.
Annapurna Circuit trek is around 2 weeks to Jomsom, though roads are shortening the time needed. Mustang trek is usually 10 days (minimum permit length) from Jomsom. The exploratory high route to Mustang via Saribung, Nar and Phu (6,328m) can be done in a 30 day round trip from Kathmandu.
It’s 17-20 days to reach Phoksumdo Lake and Juphal from Jomsom. There is a longer, high route trek from Dolpo to Mugu.
From Phoksumdo lake, Rara lake can be reached in about a week via Jumla.
From Rara, it’s around a week to Simikot and a further week to the border and return. Additionally, the fabulous Limi Valley trek can be completed in about two weeks from Simikot.
NB: these figures are a rough guide and will vary according to level of acclimatisation, route choices and weather. Additionally travel to and from Kathmandu has not been included and that typically requires a day for destinations close to Kathmandu, to two to three days when flights are involved.
Fly to Kathmandu International Airport, or travel overland from India or China. Depending on the section you trek, it maybe necessary to arrange permits in Kathmandu. This requires a working day (including Sunday) and arranging through a registered trekking agency or outfitter.
From Kathmandu travel either with internal flight or by road to the start of the trek.
It is never a good idea to walk alone. Nepal is generally thought of as safe for travellers and reports of attacks or robbery are not common, but do happen occasionally. There are annually reports of solo travellers going missing, possibly slipping from the trail or getting lost in remote terrain. These kind of accidents are less likely to happen travelling in a group.
Do always carry a map, compass, whistle, torch and other safety gear while trekking. Always inform someone about where you are going and when you should be expected to return.
Depending on where you leave the trail you'll need to walk to the road head or local airport to be transported out.