Cuando me acerco al mar, me siento más tranquilo.

Because cuando without an accent is used as a conjunction, meaning when in a sentence like this:

• Cuando me acerco al mar, me siento más tranquilo.
• When I go near the sea, I feel calmer.

Cuándo with an accent is used in questions or indirect questions:

• ¿Cuándo vienes? = When are you coming?
• No sé cuándo viene. = I don’t know when he’s coming.

So here, it is not asking a question, so cuando is correct.

Because each me belongs to a different verb:

• me acerco = I approach / I go closer
• me siento = I feel

So the structure is:

• Cuando me acerco al mar = When I approach the sea
• me siento más tranquilo = I feel calmer

In Spanish, both acercarse and sentirse are commonly used with reflexive/pronominal pronouns, so each verb needs its own me.

Yes, this is the verb acercarse.

A very useful distinction is:

• acercar algo = to bring something closer
• acercarse a = to move closer / to approach

Examples:

• Acerco la silla a la mesa. = I move the chair closer to the table.
• Me acerco a la mesa. = I move closer to the table.

So in your sentence, me acerco al mar means I go closer to the sea or I approach the sea.

Because a + el contracts to al in Spanish.

So:

• a + el mar → al mar

This is a standard contraction, just like:

• de + el → del

Examples:

• Voy al parque. = I’m going to the park.
• Vengo del parque. = I’m coming from the park.

So me acerco al mar literally means I move closer to the sea.

The present tense here expresses a habitual action or a general truth.

So the sentence means something like:

• Whenever I go near the sea, I feel calmer.
• When I’m near the sea, I feel calmer.

It is not necessarily about one single moment happening right now. Spanish often uses the present tense this way for repeated or general situations.

Because this sentence talks about a habitual or repeated situation, not a specific future event.

Compare:

• Cuando me acerco al mar, me siento más tranquilo. = When I go near the sea, I feel calmer.
  • habitual/general → present indicative

But:

• Cuando me acerque al mar, me sentiré más tranquilo. = When I go near the sea, I will feel calmer.
  • future reference → present subjunctive after cuando

This is a very common contrast in Spanish:

• cuando + indicative for usual/known/repeated situations
• cuando + subjunctive for future or not-yet-realised situations

By itself, sentir usually means to feel something, often a sensation or emotion:

• Siento frío. = I feel cold.
• Siento miedo. = I feel fear.

But sentirse is very commonly used to describe how someone feels, especially with adjectives:

• Me siento bien. = I feel well.
• Me siento cansado. = I feel tired.
• Me siento más tranquilo. = I feel calmer.

So in this sentence, sentirse is the natural choice because it is followed by an adjective describing the speaker’s state.

Because after sentirse, Spanish uses an adjective, not an adverb.

• me siento tranquilo = I feel calm
• me siento más tranquilo = I feel calmer

Tranquilamente means calmly, which describes how an action is done, not how someone feels.

Compare:

• Hablo tranquilamente. = I speak calmly.

  • adverb, describes speaking

• Me siento tranquilo. = I feel calm.

  • adjective, describes me

So tranquilo is correct because it agrees with the person’s state.

Because the adjective has to agree with the speaker’s gender.

• A male speaker would say: me siento más tranquilo
• A female speaker would say: me siento más tranquila

If the subject were plural:

• Nos sentimos más tranquilos = We feel calmer (mixed group or all male)
• Nos sentimos más tranquilas = We feel calmer (all female)

So the form of the adjective depends on who is speaking.

Yes, but normally Spanish leaves out subject pronouns unless they are needed for emphasis, contrast, or clarity.

So the neutral version is:

• Cuando me acerco al mar, me siento más tranquilo.

If you say:

• Cuando yo me acerco al mar, yo me siento más tranquilo

it sounds more emphatic, like When I go near the sea, I feel calmer with stress on I.

In most everyday contexts, Spanish prefers to omit yo because the verb forms already show who the subject is.

In standard everyday Spanish, mar is usually masculine:

• el mar

So:

• al mar = to the sea

You may sometimes see la mar, especially in poetic, regional, or expressive uses, but for learners, el mar is the normal default.

It can mean calmer, more relaxed, or more at peace, depending on context.

The comparative structure is:

• más + adjective = more + adjective

So:

• más tranquilo = calmer / more relaxed

It suggests the speaker feels a greater sense of calm when near the sea. English may translate it in slightly different ways depending on style, but the grammar is simply a comparative.

Not exactly. Acercarse al mar means to go near the sea, to approach the sea, or to move closer to the sea.

If you want to say go to the sea/beach, Spanish would more naturally use something like:

• ir al mar in some contexts
• ir a la playa if you mean go to the beach

So acercarse focuses on becoming physically closer, not just the general idea of going somewhere.

Yes. Spanish can also say:

• Me siento más tranquilo cuando me acerco al mar.

Both are correct. The difference is mainly about focus and flow:

• Cuando me acerco al mar, me siento más tranquilo.
  Starts with the condition/situation: When I go near the sea...

• Me siento más tranquilo cuando me acerco al mar.
  Starts with the main idea: I feel calmer...

Both sound natural. The original version highlights the circumstance first.

Yes, it is completely natural in Spain Spanish.

It sounds like a normal, fluent way to express a general feeling:

• Cuando me acerco al mar, me siento más tranquilo.

A speaker in Spain might also say similar things like:

• Cuando estoy cerca del mar, me siento más tranquilo.
• Cerca del mar me siento más tranquilo.

But your original sentence is idiomatic and correct.