The phrase "a hill on which" is correct and usable in written English.
It can be used to describe a specific hill that serves as a location for an action or event.
Example: "There is a hill on which the ancient ruins stand, offering a breathtaking view of the valley below."
Alternatives: "a hill where" or "a hill that serves as".
The first one managed to occupy a hill on which a French cavalry attack was repulsed, but the second corps was dislodged after a 6-hour battle and forced to reembark.
Dominating the town is a hill on which the Portuguese built a fort.
To the south stands a hill on which are ruins of the 11th-century castle of the counts (later dukes) of Vendôme.
At the edge of the desert, we approached some rising ground, more a mound than a hill, on which there was a broken structure of mud bricks.
BANDRICHIWADI, India — On the morning of July 23, Shakuntala Kirkire, a housewife in Bandrachiwadi village in the western state of Maharashtra, carried her 10-month-old daughter in her arms and walked in rain down the slope of a hill on which her village stands.
Josephus provides an unlikely account of the razing of a hill on which the Acra had stood, yet his description of the end of the Great Revolt (70 CE) provides additional evidence for it being located south of the Temple Mount: As the other buildings mentioned in the account all stood to the south in the Lower City, this also places the Acra there.
A decaying hill on which fire-red weeds grow".
In the model, the citadel sits on a low paper hill on which Mohammed's brushstrokes stand out clearly.
To the south lies Calton Hill, a spur of Forbury Hill, on which the suburbs of Calton Hill, Corstorphine and Kew are located.
North-east of the head of the Giant is an escarpment called Trendle Hill, on which are some earthworks now called The Trendle or Frying Pan.
On one side of the hill on which stands his former studio, a converted 17th century silk factory, lies the valley of Babel-like towers, out of whose innards sprout plants resembling giant trioxids.
