Reovesi

Could you clarify what Reovesi refers to? Is it a real subject (a place, person, company, concept) or a fictional/creative term? If fictional, please provide the setting (country or world, time period) and any key details you want included (etymology, history, geography, culture, economy, notable facts). If real, share the domain (geography, history, science, culture) so I can tailor a concise, neutral wiki-style article under 300 words.