Start from the Gercamp in Tsaisan and walk up the hill. prepare some offline map to head towards Tsetse Gun.
Highest peak in the immediate surroundings of Ulaanbaatar.
no
There is no Basecamp per se. Just stay in Ulaanbaatar, take a taxi to the Gercamp in the morning and hike up to Tsetsegun. Just make sure you will be back well before it gets dark!
guided recommended
South of Ulaanbaatar, hike up the mountains from the Ger camp. The peak can be reached in about 2 hours from the Ger camp. The trail through the forest can be in bad condition, especially after rain it can be very muddy. Be aware of that!
A bit remote and if you hurt your ankle, you might be on your own for a while as some areas and during certain times, there are very few tourists in the area.