SLESWICK, the duchy of, or South Jutland, is about 100 miles in length and 60 in breadth, and contains 3600 square English miles, and in 1802 about 340,800 inhabitants. It is bounded on the north by North Jutland, on the east by the Baltic sea, on the south by Holstein, and on the west by the ocean. It contains 14 cities, 17 towns, 13 castles, 278 parishes, 1480 villages, 162 farms, 116 water-mills, and 106 gentlemen's seats. It is a pleasant, fertile, populous country, and a sovereign duchy. Formerly the king of Denmark had half of it, and the other belonged to the house of Holstein-Gottorp; but the former having conquered this duchy, had the possession of it confirmed to him by the treaty of the north in 1720.