Fire crews arrived at the scene to find multiple "electric, duffy boats" on fire. They were able to extinguish the blaze by around 1:40 a.m.
The boats appear to be owned by London Boat Rentals.
At least two of the boats completely sank.
There was also some damage to the dock.
A part of the water channel is blocked off as investigators determine what caused the fire.
No injuries were reported.