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Rokið er hættulegt á fjöllum.

Rokið er hættulegt á fjöllum.
The gale is dangerous in the mountains.
From Lesson 306:Náttúran og dýrin — nature and animals·Icelandic

Questions & Answers about Rokið er hættulegt á fjöllum.

Why does hættulegt end in -t here?
The adjective hættulegt (dangerous) must match the gender of the noun it describes, rokið (the gale). Because rok is a neuter noun, the adjective takes the neuter singular ending -t. If you used the masculine word vindur (wind), it would be Vindurinn er hættulegur.
Why is the preposition á used when the English translation says in?
In Icelandic, certain geographic and natural features use á (on) where English uses in. When talking about being in the mountains, Icelanders literally say on mountains (á fjöllum).
Why is fjöllum in the dative case?
The preposition á controls either the accusative or the dative case. It takes the dative case when it describes a fixed location or a state of being, like the weather conditions currently up in the mountains. It only takes the accusative when describing movement towards a place.
What is the base form of the word fjöllum?
The dictionary form is fjall (mountain). In the plural, the vowel a shifts to ö (fjöll), and the dative plural adds the ending -um, giving us fjöllum. Icelanders often use this plural form to refer to the highlands generally.

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