Less than ten minutes by boat from Heihe Port in Heilongjiang Province, there is a simple Russian border town of Bragovichensk, referred to as Bu, which is the third largest city in Russia's Far East. Being here, sometimes you can easily forget where you are, the mobile phone card in China is even full of signals here, few people remember, this was once the territory of our country. Hailan bubble or Mongolian "black bubble" meaning, or full language "the house under the banyan tree" meaning, originally belong to the northeast of China's Daheihetun, it and today Heilongjiang Province Heihe City was originally a city, Heilongjiang passed through the city, the big Heihetun divided into two.