El viaje hacia el suroeste fue largo, pero el paisaje mereció la pena.

Hacia means towards or in the direction of, so el viaje hacia el suroeste suggests movement in that direction.

By contrast, al suroeste often means to the southwest as a destination or location.

So the difference is roughly:

• hacia el suroeste = towards the southwest
• al suroeste = to the southwest / in the southwest, depending on context

In this sentence, hacia highlights the direction of the journey.

In Spanish, compass points and regions are often used with the definite article:

• el norte
• el sur
• el este
• el oeste
• el suroeste

So hacia el suroeste is completely normal. The article is part of how these nouns are commonly used.

In Spanish, compound compass directions are usually written as single words:

• noreste = northeast
• noroeste = northwest
• sureste = southeast
• suroeste = southwest

So suroeste is just the standard spelling.

Both fue and mereció are in the preterite, which is used for completed events or for seeing something as a whole.

• El viaje ... fue largo = the journey was long, viewed as a completed event
• el paisaje mereció la pena = the scenery was worth it, as the final judgment about that completed experience

If you used the imperfect, it would sound more like background description or an ongoing situation:

• El viaje ... era largo = the journey was long / used to be long / was being long
• el paisaje merecía la pena = the scenery was worth it / seemed worth it, more descriptive or open-ended

In this sentence, the speaker is summing up a finished trip, so the preterite fits well.

Because largo agrees with viaje, and viaje is a masculine noun:

• el viaje
• un viaje largo

Spanish adjectives must agree in gender and number with the noun they describe.

So:

• viaje → masculine singular
• largo → masculine singular

Merecer la pena is a very common Spanish expression meaning:

• to be worth it
• to be worthwhile

So:

• El paisaje mereció la pena = The scenery was worth it

Literally, pena can mean pain, trouble, or effort, but in this expression you should learn the whole phrase as a set expression: merecer la pena = to be worth the trouble/effort.

Yes. Merecer la pena is basically a fixed expression.

Even though pena has meanings like sorrow, pity, or trouble in other contexts, in this phrase you do not usually translate it word by word. You learn it as one unit:

• merece la pena = it is worth it
• mereció la pena = it was worth it
• merece la pena ver esa película = that film is worth watching

So the la is part of the standard expression.

Yes. Valió la pena is another very common way to say it was worth it.

So these are both natural:

• El paisaje mereció la pena
• El paisaje valió la pena

For many learners, valer la pena is the expression they meet first. In Spain, merecer la pena is also very common and sounds perfectly natural.

Because pero joins two full ideas:

• El viaje hacia el suroeste fue largo
• el paisaje mereció la pena

In Spanish, it is normal to put a comma before pero when it connects two clauses like this, just as in English you often write ..., but ...

Spanish usually needs an article where English might sometimes omit one.

Here, el viaje refers to the journey/trip as a specific event. Using el makes it sound complete and natural.

A bare Viaje hacia el suroeste... would not work as a normal sentence opening here.

The accent mark shows where the stress goes:

• mereció → stress on the final syllable

It is also part of the standard spelling of the third person singular preterite for many -ar and -er/-ir verbs:

• habló
• comió
• mereció

Without the accent, merecio would be misspelled.

Not exactly.

• paisaje = landscape / scenery
• vista = view

In this sentence, el paisaje refers to the scenery in general, the natural surroundings seen during the trip. If you said la vista, that would often suggest a particular view from a certain spot.

So paisaje is the better word here for the broader idea of the scenery along the journey.