Londonissa
Londonissa is a Finnish word that translates to "in London". It is a prepositional phrase used to indicate location within the city of London, United Kingdom. The word itself is formed by combining the noun "Lontoo" (London) with the inessive case ending "-ssa", which signifies "in" or "inside". Therefore, when a Finnish speaker says they are going to or are currently in London, they would use the word "Londonissa".
This grammatical construction is common in Finnish, where prepositions are often integrated into the noun itself