Desde la torre, el océano parece enorme.

Desde la torre is a prepositional phrase meaning from the tower or from the tower viewpoint. Spanish often puts this kind of location phrase at the beginning to set the scene first.

So:

• Desde la torre, el océano parece enorme.
• literally: From the tower, the ocean seems enormous.

You could also say:

• El océano parece enorme desde la torre.

That is also correct. Starting with Desde la torre just gives slightly more emphasis to the point of view.

Here, desde is the natural choice because it means from in the sense of from a location or viewpoint.

• desde la torre = from the tower / seen from the tower
• de la torre usually means of the tower or from the tower in other contexts, but not as clearly for viewpoint

So if you want to say that something looks a certain way when viewed from a place, desde is very common.

Spanish usually uses definite articles more often than English does.

Here:

• la torre = the tower
• el océano = the ocean

The articles must match the noun’s gender and number:

• torre is feminine singular → la
• océano is masculine singular → el

Even when English might sometimes omit the, Spanish often keeps it.

Because the subject is el océano, which is singular.

• el océano parece = the ocean seems
• los océanos parecen = the oceans seem

The verb parecer must agree with the subject, just like English seem/seems:

• El océano parece enorme.
• Los océanos parecen enormes.

Parecer means to seem or to appear. It expresses how something looks from a certain perspective, not necessarily an absolute fact.

• El océano parece enorme. = The ocean seems enormous.
• El océano es enorme. = The ocean is enormous.

So parece fits better if the idea is from that height/viewpoint, it looks huge.

Because enorme is describing the subject el océano through the verb parece. This is a predicate adjective.

Structure:

• el océano = subject
• parece = verb
• enorme = adjective describing the subject

This is very normal in Spanish:

• La casa parece pequeña.
• El problema parece difícil.
• El océano parece enorme.

So enorme is not directly before the noun; it comes after the verb because it is part of seems enormous.

The comma marks the opening phrase as background information: it tells you the perspective before the main statement.

• Desde la torre, el océano parece enorme.

This is very natural in writing. Without the comma, the sentence may still be understandable, but the comma makes the structure clearer.

It works like English:

• From the tower, the ocean seems enormous.

Yes. Spanish is more flexible with word order than English.

These are all possible, though they sound slightly different in emphasis:

• Desde la torre, el océano parece enorme.
• El océano parece enorme desde la torre.
• Parece enorme el océano desde la torre. — grammatical, but less neutral

The most neutral versions are the first two. The original sentence sounds very natural.

Yes, often you can.

• El océano parece enorme. = The ocean seems enormous.
• El océano se ve enorme. = The ocean looks enormous.

The difference is small:

• parece = seems, appears
• se ve = looks, is seen as

In this sentence, both sound natural. Parece is slightly broader and a bit less strictly visual.

Because the stress falls on the syllable cé:

• o-cé-a-no

Without the accent mark, Spanish stress rules would make you stress it differently. The written accent shows the correct pronunciation.

In most of Spain, ce is pronounced with the th sound of think, so océano sounds approximately like:

• o-THE-a-no

Enorme is singular here because it describes el océano, which is singular.

One thing learners notice is that enorme has the same form for masculine and feminine singular:

• el océano enorme
• la torre enorme

But in the plural, it changes:

• el océano parece enorme
• los océanos parecen enormes
• la torre parece enorme
• las torres parecen enormes

So it only changes clearly in the plural: enorme → enormes.

Both are possible words, but they are not always exactly the same.

• océano = ocean
• mar = sea

If the meaning is specifically ocean, then océano is the right word. If you were talking more generally about the sea as a visible body of water from the coast, Spanish often uses mar very naturally:

• Desde la torre, el mar parece enorme.

But since your sentence says ocean, océano is correct.

The original sentence already sounds perfectly natural. But in casual speech, a speaker might also say:

• Desde la torre, el océano se ve enorme.
• Desde la torre, el océano parece gigantesco.
• Desde la torre, el mar se ve inmenso.

So the original is correct and natural, just slightly on the descriptive side rather than very casual.