Ems
- For the abbreviation or acronym EMS, please see EMS.
The source of the river is located in the southern Teutoburg Forest in North Rhine-Westphalia. In Lower Saxony the brook becomes a comparatively large river. Here the swampy region of Emsland is named after the river. In Meppen the Ems is joined by its largest tributary, the Hase river. It now runs northwards, close to the Dutch border, into Ostfriesland ("Eastern Frisia"). At Emden it runs into a bay of the North Sea called the Dollart.