Koshi

The Everest region sits at the province's northern edge, and the practical fact that shapes every visit is its front door: a short mountain airstrip whose flights are weather-dependent to a degree visitors consistently underestimate. Delays of days are normal rather than exceptional, and in busy seasons those flights have often operated from an alternative airfield several hours by road from the capital rather than from the capital itself, which adds a pre-dawn transfer to the day. Confirm which airfield you are actually departing from when you book. The alternative approach is to walk in from a lower road head, which adds days and removes the flight dependency entirely — a genuine option for anyone with time who would rather not gamble on cloud. What the routes themselves are like sits in the trekking guide.

The province's eastern ridges sit directly against the Darjeeling frontier and share its altitude, slope and climate, which means they grow tea of the same character — and Nepal's orthodox tea is genuinely good and far less known than its neighbour's, largely because much of it has historically left the country to be blended elsewhere. The town at the centre of the growing area makes an unusual and rewarding base: gardens covering the ridges in every direction, walks between villages along the contours, homestays with growing families, and a visitor economy that is almost entirely Nepali and Indian rather than Western. It is a long way east and that is precisely the point.

The third-highest mountain on earth stands on this province's eastern border, and the country around it is among the emptiest trekking ground in Nepal. Routes there are long, remote, and require permits at a higher tier along with a guide, which together keep visitor numbers to a fraction of the Everest or Annapurna regions. Lodges are sparser and simpler and some sections are genuinely committing. This is not a first Nepal trek; it is what people do on a second or third visit when the famous routes have started to feel crowded, and its reputation among experienced trekkers is correspondingly high.

On the plains at the province's southern end, a wildlife reserve occupies the braided channels and grasslands of a major river, and it offers something the country's forest parks cannot: a wetland. It is Nepal's premier birdwatching destination, on a migratory corridor that brings enormous seasonal variety, and it holds the country's last population of wild water buffalo — a genuinely rare animal, and the reserve's reason for existing. The experience is boats, grassland walks and hides rather than jeep tracks through sal forest, and the visitor numbers are a small fraction of the famous parks further west. For anyone who has already done a rhino park and wants the other half of Nepal's lowland ecology, this is it.

The province is long and the two ends have little to do with each other. The mountain end is reached by air or on foot; the eastern hills and the plains are reached by a long road journey east from the capital, or by flying to the airport on the plains and continuing by road, which most visitors with limited time do. Distances that look modest take a full day in the hills, as everywhere in Nepal. Combining the Khumbu with the tea hills in one trip is possible but genuinely ambitious, and most itineraries sensibly choose one end of the province rather than both.