El océano parece muy grande en el mapa, pero mi hija también quiere ver un desierto algún día.

In Spanish, singular countable nouns usually need an article or another determiner when you talk about them in a general or specific way.

So:

• el océano = the ocean
• un océano = an ocean

Saying just océano by itself would usually sound incomplete in a normal sentence.

Océano is stressed on the second syllable: o-cé-a-no.

The written accent shows that the stress does not follow the most basic default pattern. Without the accent, Spanish readers might stress it differently. So the accent mark tells you the correct pronunciation and stress.

Parece means seems or looks.

So:

• El océano parece muy grande = The ocean seems very big

This is different from:

• es muy grande = it is very big
• está muy grande = usually not natural here

The sentence is talking about appearance, especially on the map, not necessarily making an absolute statement about the ocean itself. That is why parece fits well.

In Spanish, adverbs like muy usually go before the adjective they modify.

So:

• muy grande = very big
• muy bonito = very pretty
• muy interesante = very interesting

Grande muy is incorrect word order.

Spanish often uses en where English uses in or on.

So:

• en el mapa = literally in the map, but naturally translated as on the map
• en la foto = in/on the photo
• en la televisión = on television

This is just a normal difference between the two languages. You should learn en el mapa as the standard expression.

With possessives like mi, tu, su, Spanish normally does not use the article.

So:

• mi hija = my daughter
• not la mi hija

Other examples:

• mi casa = my house
• nuestro coche = our car

The possessive already identifies the noun, so the article is not needed.

After a conjugated verb like querer (to want), Spanish often uses an infinitive.

So:

• quiere ver = wants to see
• quiero comer = I want to eat
• queremos viajar = we want to travel

Here:

• quiere = she wants
• ver = to see

Together: she wants to see.

También means also or too.

In this sentence:

• mi hija también quiere ver... = my daughter also wants to see...

Its position is flexible, but the chosen position is very natural. It comes before the verb phrase quiere ver and adds the idea of also to what the daughter wants.

For example:

• Mi hija también quiere ver un desierto = My daughter also wants to see a desert.
• También mi hija quiere ver un desierto is possible in some contexts, but less neutral.

Desierto is a singular countable noun, so in this sentence it needs a determiner.

• un desierto = a desert

If you said just ver desierto, that would be incorrect here.

Compare:

• quiero ver un desierto = I want to see a desert
• quiero agua = I want water

The second example has no article because agua is an uncountable noun in that context.

Algún día means someday or one day.

It refers to an indefinite time in the future:

• Quiero ir a Japón algún día = I want to go to Japan someday.

In your sentence:

• mi hija también quiere ver un desierto algún día = my daughter also wants to see a desert someday

Algún is the shortened form of alguno. This shortening happens before a masculine singular noun.

So:

• algún día = correct
• alguno día = incorrect

This is similar to:

• un libro from uno
• buen día from bueno
• primer paso from primero

This shortening is called apocopation.

The accent in algún shows the correct stress and distinguishes it from the related form algun, which is not the standard written form.

You will often see:

• algún before a masculine singular noun: algún día
• alguno when it stands alone or is not shortened
• alguna with feminine nouns: alguna vez

So the accent is part of the correct spelling of algún.

In standard Spanish pronunciation:

• h is silent
• j sounds like a strong throat sound

So hija is pronounced roughly like EE-ha with a stronger, raspier h-like sound than in English.

In Spain, the j is usually quite strong:

• hija ≈ EE-kha / EE-ha depending on how you hear it

Important points:

• The h is silent.
• The stress is on the first syllable: HI-ja.

In most of Spain, the c before e is pronounced like the th in think.

So océano sounds approximately like:

• o-THE-a-no

More precisely:

• o-THÉ-a-no
• stress on cé

In much of Latin America, that c would sound like s instead:

• o-SÉ-a-no

Both are correct in their own varieties, but for Spain, the th sound is the usual model.

Pero means but and connects two contrasting ideas.

Here the contrast is:

• The ocean seems very big on the map
• but my daughter also wants to see a desert someday

It does not mean the two ideas are opposites in a strict logical sense; it just links them with a mild contrast or change of direction in the conversation.

Sometimes, but ver is the more natural choice here.

• ver = to see
• mirar = to look at

If someone wants the experience of seeing a desert, ver sounds natural:

• quiere ver un desierto

Mirar would focus more on the act of looking at it deliberately:

• quiere mirar el desierto

So in this sentence, ver is the better, more idiomatic option.