La manta térmica pertenece a la zona segura.

In Spanish, the definite article is used more often than in English. La manta térmica means the thermal blanket.

Here:

• la = the for a feminine singular noun
• manta = blanket
• térmica = thermal

Spanish often keeps the article even where English might drop it in some contexts.

Because manta is a feminine noun in Spanish, so it takes:

• la instead of el
• feminine adjectives, like térmica

That is why you get:

• la manta térmica not
• el manta térmico

In Spanish, adjectives usually come after the noun, unlike in English.

So:

• manta térmica = thermal blanket
• literally: blanket thermal

This is the normal word order in Spanish.

Because adjectives must agree with the noun they describe.

Since manta is:

• feminine
• singular

the adjective must also be:

• feminine
• singular

So:

• manta térmica

Compare:

• el abrigo térmico = the thermal coat
• la manta térmica = the thermal blanket

Pertenece comes from the verb pertenecer, which means to belong.

So:

• pertenece = belongs

It is the third-person singular present form, used for:

• él pertenece = he belongs
• ella pertenece = she belongs
• usted pertenece = you belong
• la manta pertenece = the blanket belongs

Because pertenecer is followed by a in Spanish.

So you say:

• pertenecer a algo/alguien = to belong to something/someone

Examples:

• Pertenece a la empresa. = It belongs to the company.
• Este libro pertenece a Ana. = This book belongs to Ana.

So in your sentence:

• pertenece a la zona segura

That a is required.

Because zona is a feminine noun, so both the article and adjective must agree with it.

So:

• la zona = the zone
• segura = safe / secure, feminine singular

Together:

• la zona segura = the safe zone

For the same reason as térmica comes after manta: Spanish adjectives usually come after the noun.

So:

• zona segura = safe zone
• literally: zone safe

This is the normal and natural order.

It can suggest belonging to in the sense of:

• ownership
• membership
• being part of a category or area

In this sentence, it most likely means the thermal blanket belongs to / is assigned to / is part of the safe zone.

So it does not always have to mean personal ownership, like This belongs to me. It can also mean something fits into a group, department, section, or area.

Sometimes, but the meaning is not always exactly the same.

• pertenece a = belongs to, is part of
• es de = is from / is of / belongs to, depending on context

Pertenece a is more precise and formal for expressing belonging or membership.

For example:

• La manta térmica pertenece a la zona segura. = The thermal blanket belongs to the safe zone.
• La manta térmica es de la zona segura. could sound more like the blanket is from the safe zone or is the safe zone’s blanket, depending on context.

So pertenece a is the safer choice here.

A simple pronunciation guide:

• térmica ≈ TER-mee-ka
• pertenece ≈ per-te-NE-the in much of Spain, because ce is pronounced like th in think
• In Latin America, it would usually sound like per-te-NE-se

Also:

• the written accent in térmica shows the stress: TÉR-mi-ca

Because both nouns are specific:

• la manta térmica = the specific thermal blanket
• la zona segura = the specific safe zone

Spanish normally uses the article with each noun phrase when both are definite.

So the structure is:

• La manta térmica = subject
• pertenece a = verb phrase
• la zona segura = object of a

Yes. Pertenece is the present simple form of pertenecer.

So the sentence means that, at present, the thermal blanket belongs to the safe zone.

The full present-tense pattern is:

• yo pertenezco
• tú perteneces
• él/ella/usted pertenece
• nosotros pertenecemos
• vosotros pertenecéis
• ellos/ellas/ustedes pertenecen

Notice that yo is irregular:

• pertenezco, not perteneco