I found myself at Lechmere Canal Park this morning before meetings I had in the neighborhood.  This circular basin forms the terminus of a 750-foot-long canal which was created by walling off an existing portion of the Charles River around which it was filled with landfill.  It is used primarily by the Charles River Boat Company, which operates pleasure trips from a mooring in front of the Galleria. Private boats can also use the moorings there for mall access.