Aapajärvi is the biggest lake in Tornio, Finland. Aapajärvi is also a village with a population of about 130 (2014). The village is 38km Tornio. People in the village live near the west and north coasts of lake Aapajärvi.
The deepest point of the lake is 4.7 meters and the coastal perimeter is 10.1 kilometers.
In Finish lapland, there are two Aapajärvi lakes, another is in Pelkosenniemi.