A Mongolian oak (Q. mongolica var. dolichophylla) stands in Tokin-ri, Kim Chaek City, North Hamgyong Province, which has grown from around 1480.
It is a deciduous, broadleaf tall tree belonging to the oak family.
It is 16 metres tall with its root neck of 5.2 metres in circumference and its crown of about 20 metres in width.
Its 15 to 18-cm-long leaf is obovate oval shape, and its bark is darkish-grey. It blooms in June and its fruit ripens in September.
The tree is under preservation as a natural monument as it is of significance in deciding on the maximum age of the Mongolian oak.