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Grenen marks the junction between the strait of Skagerrak (part of the North Sea) and the Kattegat sea, and the turbulent colliding seas have created a 4 km long curved sandbar above and below the waves stretching east. The reef is still active and has grown about 1 km northeast over the last century, resulting in a mean annual growth rate of about 10 m.
The area surrounding Grenen is the place with the greatest number of observed bird species in all of Denmark. Birdwatchers regard it as the best spot in Northern Europe, for observing birds of prey during their spring migrations. Birds often gather here before crossing the seas to Bohuslän in Sweden. There are more migratory birds near Grenen when the wind is from the south-east. If the wind is from the south-west, many birds choose a route across Funen and Zealand instead. The annual Skagen Birding Festival has been celebrated here since 2005, attracting more than a thousand visitors and participants.
Grenen is also one of the best places in Denmark to observe sea mammals. Porpoises and common seals are very common here, and grey seals can be spotted here year round as well. As the area attracts many birdwatchers with binoculars, Grenen has also offered many whale sightings. The species most often reported are dolphins (especially white-beaked dolphins), northern minke whale and orcas. There have been isolated reports from Grenen of more exotic animals like walrus, hooded seal, etc.
Scientists view Grenen as a laboratory on both land formation and botany, as new land is continuously being formed and shaped here, soon to be colonized by pioneering flora.
Source: Wikipedia
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Råbjerg Mile
is a migrating coastal dune between Skagen and Frederikshavn, Denmark. It is the largest moving dune in Northern Europe with an area of around 2 km2 and a height of 40 m above sea level. It is also the only major stretch of migrating dunes in Denmark.
The dune contains a total of 4 million m3 of sand. The wind moves it in a north-easterly direction up to 18 metres a year. The dune leaves a low, moist layer of sand behind it, trailing back westwards towards Skagerrak, where the Mile originally formed more than 300 years ago.
Over 250,000 people visit the dune every year. The area is an internationally important staging site for migrating raptors.
Source: Wikipedia
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