47th Received, Utrecht, Netherlands

Thank you Marlien!  You wrote such interesting things on this postcard to us, we learned a lot!

I scanned in the back of this card to show how much was written!  We learned that the salt marshes (or kwelders) of the Wadden Sea are a very important habitat for special plants and animals.  The stamp depicts some of the birds found here.
We looked up the Wadden Sea on Wikipedia, and this is the additional information we found;
The Wadden Sea is an intertidal zone in the North Sea.  The coastline has had a lot of human influence on it, with the placement of dikes and causeways.  The sea borders three countries, the Netherlands, Denmark, and Germany.
The name Wadden comes from the Dutch word wad meaning mud flat.
There is a national park that  encompasses the sea within the German borders. 
The sea was place on the World Heritage list in 2009.