Geography
The Khumbu Valley is the upper Solukhumbu district drainage carved by the Dudh Koshi river and its tributaries, running from Lukla (2,860 m) at its lower gateway to the Khumbu Glacier beneath Everest (8,848.86 m) itself. Nearly the entire Everest Base Camp Trek, every village, monastery, and viewpoint on the classic route, sits within this single valley system, bounded by ridgelines that separate it from the neighbouring Rolwaling and Makalu valleys.
Villages by elevation
Six settlements anchor the standard route through the valley: Phakding (2,610 m), Namche Bazaar (3,440 m), Tengboche (3,860 m), Dingboche (4,410 m), Lobuche (4,940 m), and Gorak Shep (5,164 m). Each sits roughly 300 to 500 m higher than the last, the same net-gain spacing that governs safe acclimatisation pacing on every itinerary through the valley.
Sherpa settlement
The valley has been home to the Sherpa people for roughly five centuries, following migration from eastern Tibet across the Nangpa La pass. Namche Bazaar, Khumjung, Tengboche, and Dingboche are all Khumbu Valley settlements built around trade, farming, and, since the mid-20th century, trekking and mountaineering tourism.
Protected status
Almost the entire valley above Monjo falls within Sagarmatha National Park, a UNESCO World Heritage Site since 1979, protecting both the region's alpine ecology and its cultural landscape. Every trekker passes through the Monjo entry checkpoint, where the park permit is checked before the trail climbs toward Namche Bazaar.
Why the whole valley matters to trip planning
Understanding the valley as one continuous system, rather than a list of disconnected stops, explains why every EBC itinerary variation, whether 9 days or 21, follows broadly the same corridor: there is no alternative route to Base Camp that avoids the Khumbu Valley entirely, short of the technical high-pass crossings covered in the Three Passes itinerary.
Side valleys beyond the main corridor
Three named side valleys branch from the main Khumbu corridor, each home to a different itinerary variation on this site: the Bhote Koshi valley runs northwest from Namche Bazaar toward Thame and the Nangpa La, the historic Sherpa trade route into Tibet; the Imja Valley runs east from Dingboche toward Chhukung and Island Peak; and the Gokyo valley branches west from Dole toward the Gokyo Lakes and the Ngozumpa Glacier, Nepal's longest glacier. A trekker on the classic route through the main corridor sees none of these three side valleys unless their itinerary specifically detours into one.