Putteren lander i OB-området.

Because Norwegian usually marks definiteness by adding the article to the end of the noun.

• en putter = a putter
• putteren = the putter

So -en here is the definite ending.
This noun is a common-gender noun, which is why it takes -en in the definite singular.

Lander is the present tense of the verb å lande.

• å lande = infinitive, to land
• lander = present tense, lands / is landing

This is very common in Norwegian: many verbs form the present tense by adding -r.

Examples:

• å snakke → snakker
• å spille → spiller
• å lande → lander

Unlike English, the verb does not change depending on I / you / he / they. The same present-tense form is used for all subjects.

The preposition i is used because the putter ends up in an area.

In Norwegian, i is often used for being inside something or within an area:

• i huset = in the house
• i byen = in the city
• i området = in the area

Here, OB-området is understood as a zone or area, so i is natural.

You might compare:

• lander i vannet = lands in the water
• lander på greenen = lands on the green

So Norwegian chooses the preposition based on how the place is conceptualized: area/inside → i, surface → på.

Because område is a neuter noun.

• et område = an area
• området = the area

For neuter nouns, the definite singular ending is usually -et.

So:

• et hus → huset
• et område → området

In OB-området, the base noun is still område, and it still takes its normal definite ending -et.

The hyphen is there because OB is an abbreviation.

In Norwegian, when an abbreviation or initials come before a noun in a compound, a hyphen is very common and often preferred:

• TV-serie
• EU-land
• IT-bransjen
• OB-område

Then, if the whole compound is definite, the definite ending goes on the last part:

• OB-område = an OB area
• OB-området = the OB area

So the hyphen helps show the structure clearly.

OB is a golf abbreviation, borrowed from English out of bounds.

Norwegian golf language often keeps this abbreviation, so OB-området means the out-of-bounds area.

This is a good example of how Norwegian often borrows sports terminology directly from English, especially abbreviations.

No, this sentence has very straightforward word order:

• Putteren = subject
• lander = verb
• i OB-området = prepositional phrase / location

So the pattern is basically:

Subject + Verb + Place

That said, Norwegian is a V2 language, which means the finite verb normally stays in the second position in main clauses. If you move the location phrase to the front, the verb still comes second:

• I OB-området lander putteren.

That version is more marked or stylistic, but it is grammatical.

Nouns are not generally capitalized in Norwegian.

Putteren has a capital P only because it is the first word of the sentence.

So:

• Putteren lander i OB-området.
• Jeg ser putteren.

This is different from German, where all nouns are capitalized.

You could say:

En putter lander i et OB-område.

That means the nouns are indefinite:

• en putter = a putter
• et OB-område = an OB area

Compare:

• Putteren lander i OB-området. = specific putter, specific OB area
• En putter lander i et OB-område. = a putter, an OB area

So this sentence is also useful for seeing how Norwegian handles both indefinite and definite forms.