"There are many boats on the lake" is a simple way to describe this in Engpsh.
The phrase "boats on the lake" is a common Engpsh expression and does not have a specific origin. It is a straightforward description of the scene being observed.
Example sentence in Engpsh:
The lake was crowded with boats on a sunny day.
Example sentence in Chinese:
在阳光明媚的一天，湖面上挤满了船只。