Hartialinja

I’m not finding reliable information on “hartialinja.” Could you specify the domain or context you have in mind (for example: geography, biology, linguistics, culture, technology, a brand, or a fictional universe)? If you can share a source or describe what Hartialinja refers to, I can draft a concise, neutral, wiki-style article under 300 words. If you’d prefer, I can also create a fictional or hypothetical encyclopedia entry for Hartialinja—please indicate your preference.