münden in
to flow into
Describes a body of water, for example a river, flowing into a larger body of water, for example a sea, a lake, or another river.
Die Elbe mündet bei Cuxhaven in die Nordsee.
The Elbe flows into the North Sea near Cuxhaven.

to flow into / lead to
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to flow into
Describes a body of water, for example a river, flowing into a larger body of water, for example a sea, a lake, or another river.
Die Elbe mündet bei Cuxhaven in die Nordsee.
The Elbe flows into the North Sea near Cuxhaven.

The verb 'münden' (to flow into / lead to) is closely related to the noun 'die Mündung' (mouth, outlet). 'Die Mündung' refers to the place where a river ends or where a street meets a square.
Wir machten ein Picknick an der Mündung des kleinen Baches.
We had a picnic at the mouth of the small stream.
This verb almost always needs a preposition. For bodies of water and abstract results, you use 'münden in' (to flow into / lead to) with the accusative. For streets and paths, you use 'münden auf' (to open onto) with the accusative.
Der Rhein mündet in die Nordsee.
The Rhine flows into the North Sea.
In the figurative meaning, 'münden' (to lead to) is often combined with abstract nouns. Typical examples are: 'eine Diskussion mündet in einem Streit' (a discussion leads to an argument), 'die Bemühungen mündeten in einem Erfolg' (the efforts led to success), or 'die Suche mündete in einer Enttäuschung' (the search ended in disappointment).
Ihre harte Arbeit mündete in der Veröffentlichung ihres ersten Buches.
Her hard work led to the publication of her first book.
to lead
'führen zu' and 'münden in' can both describe a result or consequence. 'führen zu' is very general and neutral: a cause has a particular consequence. 'münden in' sounds more figurative and puts more emphasis on the endpoint of a longer process. It often fits when a development eventually ends in something specific, for example in an argument or a solution. Learners may confuse the words because both express a consequence. In everyday language, 'führen zu' is often simpler and more natural. 'münden in' is more precise when you want to emphasize the conclusion of a development.

Das lange Gespräch mündete am Ende in einen klaren Plan.
In the end, the long conversation led to a clear plan.
Zu wenig Schlaf führt oft zu Konzentrationsproblemen.
Too little sleep often leads to problems with concentration.