The
Münstersche Aa is a
river in the
Münster region of
Westphalia in
Germany. It is a left tributary of the
Ems. The Münstersche Aa begins near
Havixbeck, flows southeast until
Münster, and then north to
Greven, where it flows into the Ems. The total length of the Münstersche Aa is about 30 km.