The Khumbu — also called the Everest Region — is the most celebrated trekking destination on earth, a high-altitude valley in northeastern Nepal that leads to the base of the world's highest mountain. But the Khumbu is more than the approach to Everest. It is the homeland of the Sherpa people, one of the most remarkable mountain cultures on earth; it encompasses three distinct trekking routes of varying length and difficulty; and it protects the extraordinary Sagarmatha National Park, a UNESCO World Heritage Site where the Himalayan environment exists essentially as it did before the roads came.
The region covers the upper reaches of the Dudh Koshi river valley, which rises from the lowland forests of Solu (known collectively as Solu-Khumbu) to the high glacial basins below Everest, Lhotse, Cho Oyu, and Makalu. The main settlements — Namche Bazaar, Khumjung, Tengboche, and Dingboche — are Sherpa villages with Buddhist monasteries, yak herds, and an economy almost entirely based on mountaineering and trekking. Most trekkers fly into Lukla, the dramatic high-mountain airstrip that is the key to the region.
The three main routes are the Everest Base Camp trek (the classic 12–14 day return to 5,364m), the Gokyo Lakes trek (a more scenic alternative through glacial valleys), and the Three Passes route (a demanding 18–20 day circuit that crosses the Kongma La, Cho La, and Renjo La at over 5,000m each). For those with mountaineering ambitions, Island Peak (6,189m) and Mera Peak (6,476m) offer technically accessible summit climbs.
The best seasons are pre-monsoon (March to May) and post-monsoon (September to November). The trail from Lukla to base camp is genuinely crowded in October — at times a queue. The teahouse system is extensive but expensive above Namche; prices double with every thousand metres of altitude. Altitude sickness is the main hazard. No one should rush this region.