Hundreds of predominantly Iraqi migrants who have travelled through Europe to reach Finland are turning back, saying they don't want to stay in the sparsely-populated country on Europe's northern frontier because it's too cold and boring.

Migrants have in recent weeks been crossing back into Sweden at the Haparanda-Tornio border just an hour's drive south of the Arctic Circle, and Finnish authorities have seen a rise in the number of cancelled asylum applications.

"You can tell the world I hate Finland. It's too cold, there's no tea, no restaurants, no bars, nobody on the streets, only cars," 22-year-old Muhammed told AFP in Tornio, as the mercury struggled to inch above 10 degrees Celsius (50 Fahrenheit) on a recent blustery grey day.

He had already travelled from Tornio to the capital Helsinki almost 750 kilometres (465 miles) south, and then back up to the Tornio border again to return to Sweden.