Begin by climbing east up increasingly barren terrain as rhododendron forests give way to high mountains. There are superb views of the famous Dudh Kosi river and on the climb there are some tiny huts which (if they’ve been restocked recently) might sell some much needed sweet treats to keep you going.

Keep on pushing up on a good trail which zig zags to the Zatrwa Og (a subsidiary col), descends slightly and then climbs up to the Zatrwa La proper. Allow 4 - 5 hours from Chutanga to the Zatrwa La, although in snowy conditions it will take longer and may require the use of crampons.

Soak in the expansive views and then descend a ridge for 100 metres before dropping down and right to reach Tuli Kharka. Even assuming you have done an acclimatisation day before reaching this point, Tuli Kharka is still at a very high altitude for this early in a trip so move slowly, drink plenty of water and show the altitude respect.