Spring melts a path through frozen Finnish archipelago

When the ice has finally receded, locals farther inland will break out their boats and sail to summer cabins on the islands of the Merenkurkku Archipelago in the Gulf of Bothnia.

The slow thaw creates strange mottled textures across the thinning ice

The archipelago, known in Swedish as Kvarken and situated off the coast of Vaasa, has been a UNESCO World Heritage Site since 2006, drawing tourists to its natural scenery and wildlife.

The landscape, featuring thousands of islands, is largely the result of the last Ice Age.

The archipelago has been a UNESCO World Heritage Site since 2006, drawing tourists to its natural scenery and wildlife

Due to post-glacial rebound, the landmass in this region is still rising up out of the water, by a rate of some 0.9 metres (three feet) per century.

In winter the ice can reach 50 centimetres (20 inches) in thickness, making it impenetrable to most ships.

The first rains of April and warmer temperatures sees the ice start to thaw and boats can once again sail past these isolated shores

But the first rains of April and warmer temperatures sees the ice start to thaw and boats can once again sail past these isolated shores.