Which battle was founght in the most northern region?

The Battle of Stalingrad, fought during World War II from 1942 to 1943, is often considered one of the most significant battles in the northern regions of the Eastern Front. However, if referring specifically to the most northern battle, the Battle of the Somme in 1916, which took place during World War I, was one of the northernmost significant battles involving large-scale fighting. The geographical context can vary, but these battles are notable in their respective conflicts.