The most common and grand sacrificial activity of the Mongolians
is the sacrificing of Aobao. Aobao means heaps of stones. Aobao is
normally set up in hills and mountains, it is a cone-shaped solid
tower made of stone. A long pole is inserted on the top, fur or
animal skin and cloth ribbons are tied on the pole end, rocks for
incense are placed around.
Sacrificing of Aobao is mostly held in each June, July and
August. When sacrificing, the worshipper will take Hadas, mutton,
fermented milk and dairy food to the Aobao. Hadas and sacrifices
will be presented firstly and Lamas will chant Buddhist scriptures
and the other people will worship on bended knees. Then, they will
add stone or wicker to the Aobao and colorful silk strips and Sutra
streamers. After the sacrifice, such activities as horse races,
wrestling and archery will be held, the event later will develop
into a Nadamu meeting.