Vasaklukkan er á borðinu.

It is a compound noun, which is very common in Icelandic.

• vasa- = pocket
• klukka = clock/watch

So vasaklukka literally means something like pocket-clock, i.e. pocket watch.

Then the ending -n makes it definite, so vasaklukkan means the pocket watch.

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

So here:

• vasaklukka = pocket watch
• vasaklukkan = the pocket watch

And similarly:

• borð = table
• borðinu = the table in the dative singular

This is one of the first big differences English speakers notice in Icelandic.

Because the preposition á takes the dative case when it describes location.

Here the meaning is on the table as a place where something already is, so Icelandic uses the dative:

• á borðinu = on the table

If you used borðið, that would be a different case form.

So the important pattern is:

• location → often dative
• movement toward a destination → often accusative

This is a very useful contrast:

• á borðinu = on the table (location, already there)
• á borðið = onto the table / to the table surface (movement toward it)

For example:

• Vasaklukkan er á borðinu. = The pocket watch is on the table.
• Ég set vasaklukkuna á borðið. = I put the pocket watch onto the table.

So with á, the case helps show whether something is stationary or moving.

Er is the present tense form of vera, meaning to be.

In this sentence it means is:

• Vasaklukkan er á borðinu.
• The pocket watch is on the table.

More specifically, er is the 3rd person singular present form, because the subject vasaklukkan is singular.

The nouns here have different grammatical genders:

• vasaklukka is feminine
• borð is neuter

Gender matters because it affects:

• the form of the definite article
• case endings
• adjective agreement

That is why the nouns end differently:

• vasaklukkan has a feminine definite form
• borðinu has a neuter dative definite form

So even though English does not usually assign gender to nouns like this, Icelandic does, and it shows up in the endings.

Yes. This sentence has the same basic order as English:

• Vasaklukkan = subject
• er = verb
• á borðinu = prepositional phrase

So it is:

Subject + Verb + Location

That said, Icelandic word order can be more flexible than English in some contexts. But this sentence is a very normal, straightforward pattern.

A rough English-friendly approximation is:

VA-sa-kluk-kan er ow BOR-thi-nu

A few helpful pronunciation notes:

• Stress usually falls on the first syllable of Icelandic words:
  • VAsaklukkan
  • BORðinu
• á sounds roughly like ow in cow
• ð is like the th in this, though it can sound very light
• The r is usually tapped or rolled more than in standard English

You do not need perfect pronunciation right away, but noticing á and ð early is helpful.