Level of the sea

Related to Level of the sea: Mean sea level
the imaginary level from which heights and depths are calculated, taken at a mean distance between high and low water.

See also: Level

References in classic literature ?
Our business, then, is to open our trenches upon ground some hundreds of yards above the level of the sea."
"This spot is situated eighteen hundred feet above the level of the sea, in 27@ 7' N.
Some occur among the Cordilleras of the Andes, where cities, and towns, and cultivated farms are to be seen eight thousand feet above the level of the sea.
The face of the country was gradually rising, and, ere long, the barometer indicated a height of fifteen hundred feet above the level of the sea. The doctor was, therefore, obliged to keep his balloon up by a quite considerable dilation of gas, and the cylinder was hard at work all the time.
We loitered through dungeon after dungeon, away down into the living rock below the level of the sea, it seemed.
Betimes, next morning, we had reached an altitude of five thousand feet above the level of the sea. Here we camped and breakfasted.
Thompson, surveyor to the Northwest Company; who, by the joint means of the barometer and trigonometric measurement, ascertained it to be twenty-five thousand feet above the level of the sea; an elevation only inferior to that of the Himalayas.
When I wish to rise to the level of the sea, I only let off the water, and empty all the reservoirs if I want the Nautilus to emerge from the tenth part of her total capacity."
The glasses brought them to within two miles, less than that separating the summit of Mont Blanc from the level of the sea. The whole region was bristling with spikes and circles.
It seems, therefore, most probable that at a period when the land stood at a lower level there was a plain very similar to that now surrounding Callao, which being protected by a shingle beach, is raised but very little above the level of the sea. On this plain, with its underlying red-clay beds, I imagine that the Indians manufactured their earthen vessels; and that, during some violent earthquake, the sea broke over the beach, and converted the plain into a temporary lake, as happened round Callao in
We must have been more than three thousand feet above the level of the sea, and the scenery viewed from this height was magnificent.
At eleven in the morning the train had reached the dividing ridge of the waters at Bridger Pass, seven thousand five hundred and twenty-four feet above the level of the sea, one of the highest points attained by the track in crossing the Rocky Mountains.