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Draget Canal
Draget Canal ((スウェーデン語:Dragets kanal)) is a Swedish canal in the province of Södermanland.
==History==
In the 13th century, when the water level then was three meters higher than today,〔Much of Sweden was covered with a thick ice sheet during the last ice age; the great weight depressed the land. The land is still rebounding from the enormous weight of the ice (isostatic rebound), "growing out of the sea" several mm each year. This is a slow process; as a result the sea formerly covered substantial areas of what is today dry land.〕 Draget was a strait between the island of Järflotta and the mainland. It was passable by sailing vessels, and the passage was documented by Valdemar Seir, who passed through the strait on the way to his crusade in Estonia. His route is mentioned in a medieval document.
In the middle of the 19th century the depth in the strait was only three decimeters (0.3 m), and Gustaf Nerman, got the task to make a canal of the strait. But the canal continued to become shallower, and in the late 19th century it was necessary to dredge it further. The Swedish Navy's new torpedo boats were not so seaworthy that they could pass outside of Landsort, so the Navy straightened and deepened the canal with explosives.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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