We did this hike on a hot September day and the conditions were very dry, in any other conditions I would only recommend expert hikers do it. Also, be warned …
You can have beautiful alpine view - Vihren and the ridge, Popovo lake, etc. The path to the peak is mainly rocks so keep in mind when choosing your shoes. …
I do not recommend to climb this peak at all. Too dangerous. The view is not so good. A much better view is from Dzhano peak. The path from Sivria to Dzhano is too hard and dangerous.
The easiest way to reach Jangal is from Tevno Lake shelter. The duration of the transition is 1.30 h. The marking is unofficial - dots with orange color.