During the nineteenth century and most of the twentieth, the Bassin de l'Arsenal was a commercial port. In 1983, separated from the Seine by the Morland lock gate, the port was converted into a leisure port. Since that time, it has been a marina (in French, a port de pleasance), for approximately 180 pleasure boats. (Based on Wikipedia)
It was a brightful day. We walked through the squares and parks of old mansions, visited the Picasso Museum, the art galleries, had lunch at the Place des Vosges, visited the Place de la Bastille and completed the walk by the princely and quiet boardwalk of the River Seine, where live swans and peace reigns.