The middle region of the glaciers is the region best known to the votaries of the Alps, because it is the most accessible from the popular hotels. This middle region may be defined as limited by the snow-line above and the tree-level below. It is therefore larger towards the end of the season as the snow-line is pushed up by the melting of the winter snows. On the Aletsch glacier it roughly corresponds with the stretch between the Belalp and the Concordia; on the Gorner glacier with the corresponding stretch between the Riffelhorn and the foot of Monte Rosa. Its characteristic features are the open crevasses and the flowing or standing water on the surface of the ice. This is the place to come to for glacier picnics. It is the paradise of the moderate walker or the superannuated mountaineer. It is a safe region for the experienced to wander over alone, and for the inexperienced to visit with experts. You can start late and be back early. You need not venture forth before the weather has declared its intentions. Hence it is the popular glacier belt, and its beauties are best known and most widely appreciated.
If it lacks the aloofness and romance of the _névés_, it possesses ample charms of its own. The impressive silence of the heights is here replaced by a chorus of the voices of many waters. The large simplicity and sweeping forms of the snow-fields give way here to a multiplicity of detailed forms that require time to appreciate and understand. Every step in this area yields a new wonder, a fresh incident, another surprise. All around is continual change as you go along. There is no end to the features that demand and reward your attention. No wonder that glacier wandering at this level should be so popular an amusement.
What is its principal and characteristic charm? Undoubtedly the water, and the phenomena to which it gives rise. To begin with, there are the streams, small and great. The little trickles, that creep between the lumps of the uneven surface and deepen the furrow dividing them. They flow and unite together like the veins of a leaf, thus giving rise to larger arteries, and these by their union to yet larger. Thus the main drainage torrents are formed, which, on great Arctic and Himalayan glaciers, become veritable rivers, impossible to be leapt over or forded. The beds of these torrents are blue in colour and like transparent glass in aspect--a lovely contrast with the general surface of the glacier. For that is made white by the innumerable fissures that penetrate its surface, due to the dissolvent effect of the sun's heat, from which the icy water protects the bed of a stream. It is a favourite pastime to sit beside such a torrent and watch the water flow by between its white banks, one in bright sunshine, the other, perhaps, in shadow, with the blue ribbon of transparent ice between them and crystalline water scampering along with an aspect of joy in freedom.