Introduction to the Tomb of Pingan Kaguan: Traveling 105 kilometers northwest from Mordaoga, on the east bank of the Ergun River, there is a famous tombstone of the Tomb of Pingan Kaguan. This was built voluntarily by nearby residents to commemorate the martyrs such as Lu Ruifu, a card officer who sacrificed his life for the country in the fight against the Russian invasion in 1929. The tombstone is 4 meters high and has a Russian architectural style.