The pair of convection rolls under the continental shelf of Norway along 66°N is shown here:
The Convection Rolls
You can go further and visualize the next convection roll to the east, under the Norwegian mountains, as they span more or less the width of one convection roll.
I have a BS degree in geology, BA in anthropology, graduated in Chinese language and as a certified tourist guide. I provide this website about my contribution to answer the greatest question remaining about our Earth. I have analyzed the convection rolls within the Earth's mantle and how they affect the surface. This makes it possible to provide many interesting examples about geology found on my blog.
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Magic Magma 