River Euphenics is the first river introduced in Shintolin and was the longest one before the discovery of River Dea. Previously known as River Iis (named after the game's creator, Isaac) the name of the river was changed to its current form to honor Euphenics, a great player in both Shintolin and Shartak - indeed, as he began the very first settlement, he could be called the founder of civilisation in Shintolin. The river has an unnamed tributary river starting from the hill south of Deadwood.