Ainsel River is one of the optional underground zones in Elden Ring. It’s located beneath Liurnia of the Lakes in the upper west section of the world map, and as such, it can be accessed from the Ainsel River Well in that zone. The Ainsel River Well is only one of the locations from which you’ll be able to access the Ainsel River, but the way this zone is set up can be confusing. It’s split into a south side and a north side, neither of which connect directly unless you leap from the north...
