The phrase "a desk on which" is correct and usable in written English.
It can be used to describe a desk that serves as a surface for something, typically in a more formal or descriptive context.
Example: "She placed the books on a desk on which her laptop was already set up."
Alternatives: "a desk that" or "a desk where".
Because that tree could one day become a desk on which militants plan their rocket launching deeds, especially now they're working from home.
They were told to sit down at a desk, on which there was a packet of papers for them to look at.
The blue-faced man was sitting at a desk on which there were two stacks of crinkled, smoothed-out paper that had obviously been rescued from a trash can.
VCs realised that if students are paying £9,000 a year, the least they expect is a seat to sit on in lectures, a desk on which to write an essay, and somewhere warm and dry to eat a sandwich.
On entering the gallery, the viewer is greeted by a plain wooden table, about the size of a desk, on which are arrayed a number of small, variously shaped wooden objects.
The specimen was placed on top of a rotating desk, on which a total of 180 projections in 180 angular degrees were made (Video S1).
Elsewhere, hand-painted and artfully aged, a sign saying "Objetos Perdidos" is being mounted above a lost property desk, on which sit a period telephone and Spanish ticket stubs.
If you've got an old treadmill gathering dust in the basement, consider getting or setting up a make-shift desk on which to do your work while walking at a casual pace.
In London, a sturdy walnut desk, on which stands Hubbard's name-plate, takes centre stage.
A poster for the 1983 movie "WarGames" — a major influence — hung above his desk, on which were four computer monitors: one for writing program code, one for watching data traffic, one for surfing the Web, and one for chatting with customers.
"This does definitely prove he lied to the news media and has lied the whole time," Mr. Jones said from behind his desk, on which rested a pistol, a Bible and a rental copy of the film "Se7en".
