The Slovene coast which measures 46.6 kilometres is covered with abundant vegetation. Here is a natural reserve with a rich supply of marl and sandstone and the unique Strunjan cliff which ascends 80 metres above the sea and is the highest flysch wall on the Adriatic coast. Here are the Sečovlje saltworks, first mentioned in the 13th century. Due to their extremely abundant natural and historical heritage they were named a regional park and are a rich sanctuary of plant and animal worlds. They play a very important role in the world of ornithology, because they offer ideal conditions for birds due to the warm climate and abundance of food in the saltwork pools. So about 200 bird species have been seen at the saltworks and they provide a natural habitat for about 80 bird species which nest there.