The Superessive case
is a grammatical declension
indicating location on top of something or on the surface of something. Its name comes from Latin supersum, superesse
: to be over and above.
While most languages communicate this concept through the use of adpositions, there are some, such as Hungarian which make use of cases for this grammatical structure.
An example in Hungarian: a könyveken means "on the books", literally "the books-on".
In Finnish, superessive is a type of adverb. For example:
kaikkialla means "everywhere" (literally "everything-at")
täällä means "(at) here" (from tämä - "this", lit. "at this place")