Elder Kings is an Elder Scrolls themed total conversion for the Paradox Development Studio game Crusader Kings 2. It allows players to live out their dreams of ruling one of the great realms of Tamriel and leading their dynasty through it's various eras and challenges. While still effectively a Work-In-Progress Project, Elder Kings still offers one of the biggest gameplay experiences available for a released CK2 mod!
A couple of navigable rivers, the Brena River, seperating Cyrodiil and Hammerfell, and the Strid River, cutting a path into the border of Cyrodiil and Valenwood.
More navigable rivers will be added in later versions, however the work involved in making them look "respectable" is a little more than just cutting into the landscape. The Brena and Strid were the only two rivers I felt comfortable including with their look.