Lake Haapajärvi is a middle size lake in the area of Iisalmi, Northern Savonia, Finland. There are 38 lakes with the name Haapajärvi in Finland, with this particular lake being the largest in size.

See also List of lakes in Finland

References Finnish Environment Institute: Lakes in Finland Etelä-Savon ympäristökeskus: Saimaa, nimet ja rajaukset