La deklivo finiĝas ĉe la montpasejo.

Because finiĝi means to come to an end / to end, while fini usually means to end something / to finish something.

So:

• La deklivo finiĝas = The slope ends
• Li finas la laboron = He finishes the work

The ending -iĝ- often shows that something becomes a certain way or undergoes a change by itself, rather than actively doing it to something else.

In this sentence, the slope is not ending something else. The slope itself comes to an end.

You can break finiĝas into parts:

• fin- = end, finish
• -iĝ- = become / get into a state / happen to itself
• -as = present tense

So finiĝas literally has the idea of is becoming finished or more naturally ends.

This pattern is very common in Esperanto:

• malfermi = to open something

• malfermiĝi = to open, to become open

• fermi = to close something
• fermiĝi = to close, to become closed

Because finiĝas here is intransitive. That means it does not take a direct object.

• La deklivo finiĝas = the slope ends
• not: La deklivo finiĝas ion

If you use fini transitively, then you can have an object:

• La laboristo finas la vojon = The worker finishes the road

But in your sentence, the action is simply that the slope reaches its endpoint.

Ĉe often means at, by, near, or in the area of, depending on context.

In this sentence:

• ĉe la montpasejo = at the mountain pass / by the mountain pass

It marks the location where the slope ends.

A useful thing to remember is that ĉe is often a fairly general location word. It does not necessarily mean being inside something.

Because ĉe describes location, while al usually shows movement toward something.

Compare:

• La deklivo finiĝas ĉe la montpasejo = The slope ends at the mountain pass
• Ni iras al la montpasejo = We are going to the mountain pass

Your sentence is not about motion toward the pass. It is about the place where the slope comes to an end.

Because ĉe is a preposition, and nouns after prepositions normally do not take the accusative -n.

So:

• ĉe la montpasejo is correct

The accusative -n is mainly used for:

1. direct objects
2. direction in some expressions

Here, la montpasejo is neither a direct object nor a directional accusative. It is simply the object of the preposition ĉe.

La is the definite article, meaning the.

So:

• la deklivo = the slope
• la montpasejo = the mountain pass

Esperanto uses la much like English the. In this sentence, both things are treated as specific and identifiable.

If you removed la, the sentence would sound more like:

• Deklivo finiĝas ĉe montpasejo

That would usually feel less natural in ordinary usage unless the context strongly supports it.

Deklivo means slope.

It comes from:

• dekliv- = slope
• -o = noun ending

You do not necessarily need to analyze it further every time, but it is a standard noun. In context, it refers to a sloping stretch of land or road.

Yes. Montpasejo is a compound word:

• mont- = mountain
• pas- = pass, go through
• -ej- = place
• -o = noun

So montpasejo literally means something like mountain-passage-place, which corresponds to mountain pass in English.

This is a very typical Esperanto compound: several meaningful parts combine into one clear word.

The normal word order is straightforward:

• La deklivo = subject
• finiĝas = verb
• ĉe la montpasejo = location phrase

So the sentence follows a familiar pattern: subject + verb + place.

Esperanto word order is fairly flexible, so you could rearrange it for emphasis:

• Ĉe la montpasejo finiĝas la deklivo

That is still grammatical, but the original order is the most neutral and easiest for learners.

Finiĝas is pronounced roughly fee-NEE-jahs, with the stress on NI:

• fi-NI-ĝas

A few details:

• ĝ sounds like the j in judge
• i is like ee
• Esperanto stress almost always falls on the second-to-last syllable

So:

• fi-ni-ĝas → stress on ni

Yes, depending on context. Deklivo is basically slope, but in natural English, that might sometimes be rendered as:

• The slope ends at the mountain pass
• The incline ends at the mountain pass
• The descent ends at the mountain pass

The best choice depends on what kind of slope is meant. The Esperanto itself does not force a very narrow English wording.

Not exactly.

• ĉe la montpasejo = at / by the mountain pass
• en la montpasejo = in the mountain pass

Using en would suggest that the endpoint is inside the pass itself. Using ĉe is broader and often more natural if you just mean the slope ends in that area.

So the original sentence is a good choice if the exact idea is simply that the slope comes to an end at that location.