El desplome termina en la presa final.

Desplome is a masculine singular noun, so it takes the masculine singular article el.

• el desplome = the collapse / the plunge / the drop

A learner might expect a noun related to an action to end in -ción or -miento, but Spanish has many nouns with less predictable forms. You usually just have to learn the gender with the noun:

• el desplome
• los desplomes

Desplome often refers to a collapse, sharp drop, plunge, or something that falls steeply. The exact nuance depends on context.

It can be used:

• literally, for a physical drop or collapse
• figuratively, for a sudden fall in prices, performance, popularity, etc.

So in this sentence, the learner should understand that desplome is the thing that ends at or leads into the final part described by la presa final.

Because the subject is el desplome, which is third person singular.

The verb terminar is conjugated here in the present indicative:

• yo termino
• tú terminas
• él/ella termina
• nosotros terminamos
• ellos terminan

So:

• El desplome termina... = The collapse/drop ends...

The verb must agree with the subject, and el desplome is singular.

With terminar, Spanish often uses en to mean to end in, to end at, or to end with, depending on context.

Examples:

• La película termina en tragedia.
• El camino termina en el río.
• La discusión terminó en gritos.

So termina en la presa final means that the desplome ends at/in that final point or structure.

English and Spanish do not always use prepositions in exactly the same way, so terminar en is a useful pattern to remember.

Presa most commonly means dam in many contexts, especially physical geography or engineering.

However, presa can also mean:

• prey
• prisoner
• something gripped or caught, in some expressions

In this sentence, because of en la presa final, it most likely refers to a physical structure or terminal section in a landscape or system. The exact meaning depends on the broader context, but grammatically it is a feminine singular noun:

• la presa
• las presas

In Spanish, adjectives usually come after the noun, especially when they are simply classifying or describing it.

So:

• la presa final = the final dam / final barrier / final section

Putting the adjective before the noun is sometimes possible, but it often sounds more literary, emphatic, or changes the nuance. For an ordinary descriptive phrase, noun + adjective is the normal order.

Final is an adjective that has the same form for masculine and feminine singular:

• el tramo final
• la presa final

It only changes in the plural:

• los tramos finales
• las presas finales

So final agrees in number, but not visibly in gender in the singular.

Yes. The verb terminar can mean both to finish and to end, depending on context.

Common uses:

• Termino el trabajo. = I finish the work.
• La reunión termina a las cinco. = The meeting ends at five.
• El camino termina aquí. = The road ends here.

In your sentence, termina is best understood as ends, because el desplome is not actively finishing something; it is itself reaching its endpoint.

Yes, it is in the present indicative: termina.

Spanish often uses the present tense for:

• general truths
• descriptions
• instructions
• commentary
• things that habitually happen

So this sentence can sound like:

• a factual description
• a technical explanation
• a narration of what a route, drop, or structure does

That is very normal in both spoken and written Spanish.

In standard Spanish from Spain, it would be pronounced approximately:

des-PLO-me

The stress falls on plo because words ending in a vowel normally stress the second-to-last syllable.

A rough English-friendly guide:

• des = like dess
• plo = like ploh
• me = like meh

So: dess-PLOH-meh

Spanish uses definite articles more often than English does. Here they identify specific nouns within the context.

• el desplome = a specific plunge/collapse/drop being discussed
• la presa final = a specific final dam/barrier/section

English sometimes omits the where Spanish keeps it, but in this sentence the articles are completely natural and expected.

Yes. That version is grammatically correct.

• El desplome termina en la presa final.
• En la presa final termina el desplome.

The meaning stays basically the same, but the emphasis changes:

• the original starts with the subject, so it feels more neutral
• the reordered version emphasizes where it ends

Spanish word order is more flexible than English, although not completely free. The original sentence is the most straightforward version.