The sand
tombolo of Agger Tange was created around 1100 AD, as a result of natural
siltation. The
North Sea coast is often windy and fierce, and Agger Tange has experienced many smaller floods during storms. In 1825, a severe storm breached and created what became known as the Agger Channel (in Danish:
Agger Kanal or
Aggerkanalen), effectually merging the North Sea with the brackish Limfjord permanently. The channel gradually widened, but closed up again during the 1850s, again due to natural siltation. The southern part of the breached tombolo, across the Thyborøn Channel, is known as Harboøre Tange, referring to the railroad town of
Harboøre at the south base of the peninsula. The flooding event in 1825, separated the northernmost part of Jutland from the mainland, thus creating the
North Jutlandic Island. The breach made it possible to sail from the North Sea to the
Kattegat, shortcutting the
Skagerrak Sea, and the Agger Channel and Thyborøn Channel soon became important for international traffic. In 1875, the Thyborøn Channel was secured and improved to serve seafaring traffic better. In World War II, during the
German occupation of Denmark, Agger Tange became part of the
Atlantic Wall with several bunker fortifications. File:Agger in Denmark - Agger Tange - Bunker (16).jpg|Bunker remnants from World War II File:Agger in Denmark - Agger Tange - Lange Mole (13).jpg|Modern coastal protection File:Agger in Denmark - Agger Tange (15).jpg|Groynes File:Agger Tange Forfyr Unterfeuer.jpg|Lighthouse installation File:Vestkystruten Agger Tange.jpg|The road on Agger Tange File:Thyborøn-Agger Tange Færge.jpg|Car ferry servicing the Thyborøn Channel File:Agger in Denmark - Agger Tange (17).jpg| == Nature ==