säässä

I can write a concise, neutral wiki-style article about sässä, but I need clarification on what it refers to. Is sässä a geographic location (place, river, region), a personal surname, a term in a specific field (language, culture, science), or a fictional concept? Providing the intended sense will help me craft an accurate article under 300 words. If you’d prefer, I can also create a generic stub that treats sässä as an undefined or rarely attested term, suitable as a starting point pending more details.