Matochkin Strait, Russia
The Matochkin Strait (“Ма́точкин Шар” in Russian) is one of the largest Fjords in the world. It is about 100 kilometers long and about 600 meters wide at its narrowest point.
Located in the Arctic, the strait connects the Barents Sea in the west with the Kara Sea in the east (Google Maps). It separates the two islands of the Novaya Zemlya archipelago, Severny Island in the north and Yuzhny Island in the south. The archipelago is an extension of the Ural Mountains and as such is quite mountainous.
In this image comparison you can see a natural color view acquired by the Sentinel-2A satellite on July 17th, 2016 and a NIR/SWIR view. In the NIR/SWIR view ice and snow are showing up in light-blue hues, vegetation in green hues and rock in red-orange hues.
You can download full-size versions of the these images with a resolution of 10 meters/pixel on Flickr.