Loch Leven in Kinross-shire, along with Clunie Loch and Loch of the Lowes (and the ospreys) in Perthshire, and Scotland’s only Lake, the Lake of Menteith in Stirlingshire, was scraped out by glaciers in the Ice Age, then filled with sand and gravel as the glacier retreated – and hence is shallow, broad, wreathed in strange mists, and horizontal in tone. Wide enough to be a honeypot for thousands of wildfowl in winter, secret enough for a Queen to be imprisoned on one of its islands, shape-shifting and elusive enough for ghosts and rare species.

Walk around its margins; there will be places from which the opposite shore can barely be discerned. Go on a grey autumn day when the rain in the air seems suspended in horizontal bands, and upsurging clumps of grass and reeds appear discordant, almost angry in their violation of the horizontal.

Here and there you’ll find beaches, sandy from the glacier’s retreat; the wind makes small glacial waves that smell of no sea but fool the dog – and then it becomes still. Bands of horizontal clouds are reflected in the mirror surface of the water; subtle stripes of cream and grey and black and white, settling on the horizontal tops of the surrounding hills.

Pockets of peaty marshland, studded in autumn by vivid blue sheeps’ scabious and emphatically solitary flowers of the Grass of Parnassus, spiral around flat pools of oily water, reflecting snatches of sky. Larger raised bogs, pillaged in previous centuries for their peat, lie flat and sullen. When the peat was no longer wanted, they grew conifers on the “useless” land. Now the conifers are retreating after the long-forgotten glaciers; the water returns; dragonflies, amphibians and sphagnum once more fill the horizontal expanse between the forest.  Heaths and ling guide the trespasser to the dryer paths, and felled branches bridge the bog where water maintains its horizontal sovereignty.

In fields by the loch, the damp rises in horizontal layers, coating logs and stumps and gate-posts with moist, green mosses and algae. In one field a whole tree fell, years ago. In this damp environment it has not died, but adapted to its horizontal status and continued to grow; a miniature forest of shoots, epiphytes and primitive plants along its horizontal trunk.

The old river, the Leven, first to score a path through the glaciated landscape, tears out of the loch at the Sluice House, which straddles it, flat and low, and flows out to feed Fife, rural and industrial. Its lines are also straight and keenly defined; kingfishers dart horizontally beneath overhanging branches. Ripples march in military formation downriver.

Quiet, grey, the glacial loch behind you retreats into its bands of mist, its unseen wild occupants, its secrets and loveliness.