The Füsinger Au is a small river that runs through the Angeln area northeast of Schleswig. In Winning it flows into the Schlei. For centuries the river could be crossed with a small ferry close to the mouth, the Dreilingsfähre. Today the ferry is gone, replaced by a bridge, which was refurbished not long ago.
I took this photo looking from that bridge up the river.
View Schlei:52 in a larger map