The Bertusnol is the heighest dune on the island Texel. It is located at the Geological Monument Western Coast of Texel. This broad strip of dunes runs from the most northern part of Texel near the lighthouse of De Cocksdorp until the most southern part of the island near De Hors. This monument is one of the seventeen Geological Monuments of the province Noord-Holland. The strip is also a part of the national park Dunes of Texel, one of the twenty national parks of the Netherlands.
Texel and her dunes
The centre of Texel consists of a stabile layer of clay. It was built during 130000 years, layer upon layer, below the glaciers. Much later, the sea played an important role in the development of the island and her dunes. In the twelfth century, the sea divided Texel in two parts. The area between De Koog and Den Hoorn and west of De Cocksdorp remained dry. Here you can find the highest dunes of Texel. From the fourteenth century, the part between the dunes near De Koog/Den Hoorn and the eastern part of the island were poldered. To the north of Texel, the small island Eierland was located. In 1630 the two islands have been connected by wind dikes on which young dunes were formed.
Men and nature in harmony
Until the seventeenth century, Texel was ruled by nature. Later on, it became more and more a balance between men and nature. Inhabitants of Texel stimulated the development of wind dunes by constructing wind dikes. The oldest is the Zanddijk from the year 1630. On the large sand planes, the sand blew against the dikes and young wind dunes were formed. Because the wind blew from one direction only, nice parabola dunes were formed. In 1858 the sea broke through one on the newly formed wind dikes. One remained open: the Slufter.
To log this cache you have to do a few things.
- Park your cache mobile at
N 53 06.400 E 004 46.075. You can park your bicycle there too or at
N 53 06.265 E 004 46.387.
- Go to the Bertusnol at
N 53 06.873 E 004 46.538. This is a very nice hike through the Monument of at least 1 km.
- Determine the height of the Bertusnol with an accurancy of 10 cm. This gives you the height AB,C meter.
- Post an e-mail to the address texelABC@gmail.com where you replace ABC by the digits from the previous instruction. Put your nickname in the subject field.
- After permission you can log.
- It would be nice if you would take a picture of the surroundings and attach it to your log.