pitkinä

Could you clarify what you mean by "pitkinä"? It could refer to different things in Finnish—perhaps the adverbial/locative form connected to the word pitkin (as in "pitkin tietä" meaning along the road), a grammatical form in Finnish, or a proper noun (such as a place, title, or name). If you specify which sense you want, I can write a concise, wiki-style article under 300 words. If you’d like a general linguistic overview of the Finnish form pitkinä, I can provide that as well.