Hárþurrkan er í baðherberginu.

In Icelandic, the is usually attached to the end of the noun instead of being a separate word.

So:

• hárþurrka = hair dryer
• hárþurrkan = the hair dryer

And:

• baðherbergi = bathroom
• baðherberginu = in the bathroom here, with both the definite ending and the correct case ending

This attached the is called the definite article suffix.

Because hárþurrka is a feminine noun, and in the nominative singular definite form it becomes hárþurrkan.

In this sentence, hárþurrkan is the subject, so nominative is the expected case.

A useful pattern to notice is:

• hárþurrka = a hair dryer / hair dryer
• hárþurrkan = the hair dryer

So the ending -n here is part of the definite form.

Because the noun comes after í and means in the bathroom, which expresses location, not movement. With í, Icelandic normally uses:

• dative for being in a place
• accusative for moving into a place

So here, since the hair dryer is already located there, baðherbergi must be in the dative singular definite form:

• baðherberginu = in the bathroom

By contrast:

• baðherbergið is the nominative/accusative singular definite form, meaning the bathroom

There are two important cases here:

• hárþurrkan is in the nominative, because it is the subject
• baðherberginu is in the dative, because it follows í in a location meaning

So the sentence is a good example of:

• subject in nominative
• place expression in dative after a preposition

Not always. Í can take either dative or accusative, depending on meaning.

A simple rule:

• í + dative = in a place, location
• í + accusative = into a place, movement toward it

So:

• Hárþurrkan er í baðherberginu = the hair dryer is in the bathroom
• if someone were going into the bathroom, you would expect accusative instead

This location-vs.-movement contrast is very important in Icelandic.

Er is the 3rd person singular present tense of the verb vera, which means to be.

So:

• vera = to be
• er = is

That is why Hárþurrkan er í baðherberginu has the same basic structure as The hair dryer is in the bathroom.

The dictionary forms are:

• hárþurrka — feminine
• baðherbergi — neuter

That matters because gender affects:

• the form of the definite article
• case endings
• adjectives that agree with the noun

In this sentence, you can see the gender reflected in the definite forms:

• hárþurrkan for the feminine noun
• baðherberginu for the neuter noun in dative definite

This sentence has a very straightforward, neutral word order:

• Hárþurrkan = subject
• er = verb
• í baðherberginu = prepositional phrase showing location

So it follows a familiar pattern:

• subject + verb + place

That said, Icelandic word order can change more easily than English word order, especially because Icelandic uses case endings. But this sentence is the most basic and natural way to say it.

These two letters are very common in Icelandic:

• þ is pronounced like th in thin
• ð is pronounced like th in this

So in this sentence:

• þ appears in hárþurrkan
• ð appears in baðherberginu

Another useful pronunciation tip: Icelandic usually stresses the first syllable of the word.

Yes. Icelandic uses compound words very often.

• hárþurrka is built from parts meaning hair
  • dryer/drying device
• baðherbergi is literally bath-room

This is very typical of Icelandic vocabulary. Learning to recognize compounds can make long words much easier to understand and remember.