La recinzione metallica è vicina alla parete di vetro.

Because both recinzione and parete are feminine singular nouns.

• la recinzione = the fence
• la parete = the wall

In alla parete, the la is still there, but it has combined with the preposition a:

• a + la = alla

So alla parete means to the wall / by the wall / near the wall, depending on context.

Yes, recinzione often translates as fence, but it can be a bit broader than the English word.

It can refer to:

• a fence
• an enclosure
• a barrier around an area

So la recinzione metallica is literally the metal fence or the металлический enclosure/barrier, depending on context. In this sentence, metal fence is the most natural translation.

Because adjectives in Italian usually agree with the noun they describe in gender and number.

Here:

• recinzione is feminine singular
• so the adjective must also be feminine singular: metallica

Compare:

• il cancello metallico = the metal gate
• la recinzione metallica = the metal fence
• le recinzioni metalliche = the metal fences

For the same reason: vicino is being used like an adjective and must agree with recinzione.

The subject is:

• La recinzione metallica

Since that subject is feminine singular, we get:

• è vicina

Compare:

• Il tavolo è vicino alla finestra. = The table is near the window.
• La sedia è vicina alla finestra. = The chair is near the window.

È is the third-person singular of essere (to be).

So:

• La recinzione metallica è vicina...
• The metal fence is near...

It links the subject (la recinzione metallica) to its description (vicina alla parete di vetro).

Also note the accent:

• è = is
• e = and

That accent matters.

In Italian, vicino/vicina is commonly followed by the preposition a when you say what something is near.

So:

• vicina a la parete would be the full form in theory
• but Italian contracts it:
• a + la = alla

So:

• vicina alla parete = near the wall

Other examples:

• vicino al parco = near the park
• vicina alla scuola = near the school
• vicini ai negozi = near the shops

Italian very often uses di + material to describe what something is made of.

So:

• parete di vetro = wall of glass / glass wall
• tavolo di legno = wooden table / table made of wood
• porta di metallo = metal door

English sometimes prefers an adjective (glass wall), but Italian often prefers di + noun.

So parete di vetro is completely normal and natural.

Usually parete means a wall, especially a wall of a room or a vertical surface. It is often used when talking about the side of a building, a partition, or an interior wall.

It is different from some related words:

• muro = wall, often more solid or structural, like a stone or brick wall
• parete = wall/surface/partition, often used in architectural or interior contexts

A parete di vetro sounds natural because it suggests a wall-like glass surface or partition.

It can be both, depending on the structure.

In this sentence, it behaves like an adjective:

• La recinzione è vicina alla parete.
• It agrees with recinzione, so we get vicina.

But Italian also has adverbial uses, for example:

• Abito vicino. = I live nearby.
• Vieni più vicino. = Come closer.

So learners should notice whether vicino is describing a noun/subject or functioning more like nearby/closer.

In standard Italian, that would usually be considered incorrect in this sentence.

Because the subject is la recinzione, feminine singular, standard agreement requires:

• è vicina

You may sometimes hear less careful agreement in speech in some contexts, but for learners, the correct form to use is:

• La recinzione metallica è vicina alla parete di vetro.

The structure is:

• La recinzione metallica = subject
• è = verb
• vicina alla parete di vetro = complement/predicate description

So the pattern is basically:

Subject + to be + adjective phrase

This is very similar to English:

The metal fence + is + near the glass wall.

It would become:

Le recinzioni metalliche sono vicine alle pareti di vetro.

Changes:

• la → le
• recinzione → recinzioni
• metallica → metalliche
• è → sono
• vicina → vicine
• alla → alle
• parete → pareti

This shows how much agreement matters in Italian.

A helpful approximate pronunciation is:

lah reh-cheen-TSYOH-neh meh-TAHL-lee-kah eh vee-CHEE-nah AHL-lah pah-REH-teh dee VEH-troh

A few useful pronunciation notes:

• c before i in recinzione sounds like ch in English
• z in recinzione is pronounced like ts
• ch in vicina? There is no ch spelling, but ci here gives a chee sound
• è is pronounced like eh
• double ll in alla should be held a bit longer than a single l

Yes — this sentence is a very good example of three core Italian patterns:

1. Noun + adjective agreement

   • recinzione metallica
   • è vicina

2. Preposition + article contraction

   • a + la = alla

3. Material expressed with di

   • parete di vetro

If you understand those three things, you understand a lot of how this sentence works.