Við dáumst að útsýninu frá fjallinu.

Because the dictionary form is dást að, not dá að. This is a middle-voice verb, and the -st is part of the verb itself in this meaning.

So við dáumst means we admire / we marvel at.

For learners, it is best to remember the whole pattern as dást að + dative.

No. Icelandic að can be more than one thing.

Here, að is a preposition, not the infinitive marker. It is required by the verb dást. With this verb, að introduces the thing being admired, and that noun goes into the dative case.

So in this sentence, að útsýninu is not to view or anything like that. It is the prepositional phrase that goes with dáumst.

The base noun is útsýni, a neuter noun.

In this sentence it appears as útsýninu because:

• the verb pattern is dást að + dative
• so útsýni must be in the dative
• the ending also includes the definite article, so it means the view

So útsýninu is basically the view in the form required after að.

Because frá always takes the dative case in Icelandic.

The noun is fjall (mountain), and its dative singular definite form is fjallinu.

So:

• frá fjalli = from a mountain
• frá fjallinu = from the mountain

In Icelandic, the definite article is very often attached to the end of the noun instead of being a separate word.

So:

• útsýninu = the view in dative
• fjallinu = the mountain in dative

This is very normal in Icelandic. English uses a separate the, but Icelandic often uses a suffix instead.

Við here is the nominative plural pronoun meaning we.

It is in the nominative because it is the subject of the sentence.

A small extra point: við can also be a preposition in other sentences, but here it is clearly the pronoun we because it is the subject before the verb.

Most naturally, it describes útsýninu.

So the sentence is understood as the view from the mountain, not primarily we admire it from the mountain.

That is the most natural reading because frá fjallinu comes right after útsýninu and fits it well as a noun modifier.

It is present tense, first person plural.

So Við dáumst means we admire or sometimes we are admiring, depending on context. Icelandic present tense can cover both ideas that English often separates.

You add ekki:

Við dáumst ekki að útsýninu frá fjallinu.

That means We do not admire the view from the mountain.

No. In Icelandic, accent marks usually show a different vowel sound, not just stress.

So á, ú, and ý are not just the plain vowels with extra emphasis. They count as distinct vowel spellings with their own pronunciation values.

Also, Icelandic stress normally falls on the first syllable of the word anyway, so the accent marks are mainly about vowel quality, not stress placement.

No. This is a very normal, neutral Icelandic sentence:

• Við = subject
• dáumst = verb
• að útsýninu = prepositional phrase required by the verb
• frá fjallinu = phrase describing the view

So the structure is straightforward and natural.