Die Naht endet an der Stoffkante.

Naht is a feminine noun in German, so its dictionary form is die Naht.

In this sentence, die Naht is also the subject, so it stays in the nominative case:

• die Naht = the seam

This is something you usually have to learn together with the noun:

• die Naht
• der Stoff
• die Kante

German articles are an important part of vocabulary learning.

The verb is enden = to end.

Here it is conjugated for die Naht, which is third person singular:

• ich ende
• du endest
• er/sie/es endet
• wir enden

Since die Naht is grammatically she/it (sie), the correct form is endet.

So:

• Die Naht endet = The seam ends

Because an is a two-way preposition. It can take either:

• dative for location
• accusative for direction/movement toward

In this sentence, the seam is being described as ending at the fabric edge. This is treated as a location/resulting position, not motion toward a destination, so German uses the dative:

• an der Stoffkante = at the fabric edge

Compare:

• Die Naht endet an der Stoffkante. = The seam ends at the fabric edge.
• Ich lege den Stoff an die Kante. = I place the fabric against/to the edge.

So der here is dative, not accusative.

Good question. Stoffkante is feminine, and its basic form is:

• die Stoffkante

But after an in a location sense, it takes the dative case. The feminine article changes like this:

• nominative: die Stoffkante
• dative: der Stoffkante

So:

• an der Stoffkante = at the fabric edge

This is one of the most common things learners notice in German: the article changes to show the case.

It is one compound noun:

• Stoff = fabric, cloth
• Kante = edge

Together:

• Stoffkante = fabric edge / edge of the fabric

German very often combines nouns into a single word. The last part usually determines the gender:

• die Kante is feminine
• therefore die Stoffkante is also feminine

You can think of it as:

• fabric-edge

This is standard German main clause word order:

• Subject + verb + rest

So:

• Die Naht = subject
• endet = finite verb
• an der Stoffkante = prepositional phrase

German main clauses normally put the conjugated verb in second position. Since the subject comes first here, the verb comes right after it.

You could also move another element to the front for emphasis:

• An der Stoffkante endet die Naht.

That is still correct, but now the verb endet remains in second position.

Here an is best understood as at or on/along the edge, depending on context.

German an often covers meanings that English splits into several prepositions:

• at
• on
• against
• by

In an der Stoffkante, the idea is that the seam ends at the edge of the fabric.

So the exact English translation can vary a little, but the German is natural for describing position relative to an edge.

• die Naht = nominative
  It is the subject of the sentence.

• der Stoffkante = dative
  It comes after an, which takes the dative here because it expresses location.

So the sentence structure is:

• Die Naht = subject
• endet = verb
• an der Stoffkante = prepositional phrase in the dative

In German, all nouns are capitalized, not just proper names.

So in this sentence:

• Naht
• Stoffkante

both begin with capital letters because they are nouns.

This is a standard rule in German writing and helps you spot nouns more easily when reading.