evidence: The Sixty-Four Villages East of the River were a group of Manchu, Daur and Han-inhabited villages located on the left (north) bank of the Amur River (Heilong Jiang) opposite of Heihe, and on the east bank of Zeya River opposite of Blagoveshchensk. The area totaled 3,600 square kilometers (1,400 sq mi). Among Russian historians, the district occupied by the villages is sometimes referred as Zazeysky rayon (the "Trans-Zeya District" or "The district beyond the Zeya"), because it was separated by the Zeya from the regional capital, Blagoveshchensk.