There is a marble boat by the lake in the Summer Palace.
Tips
usage
舫 usually means an ornamental pleasure boat, as in 画舫 (a decorated lake barge) and 石舫 (a stone boat-shaped pavilion). Its older sense, two boats tied together, is now literary only.
方 gives the sound, shifting tone from fāng to fǎng. It also faintly fits the old 'two boats side by side' sense, since 方 can suggest things set parallel.
