Across the Sverdrup Channel lies the much larger Axel Heiberg Island, where glaciers (blue) huddle among mountain peaks (yellow) and flow into deep fjords.

In the regulation design of navigation channel of mountain rivers, rapids suppression hydraulic indexes should firstly be determined.

What had been a few black clouds a moment before now filled half the sky, and were bearing down upon us, pressing ominously towards the channel. The mountain path grew narrower and steeper.