Romkartet viser forbudssonen.

Because Norwegian usually writes compound nouns as one word.

Here, romkartet is a compound:

• rom
  • kart
    • -et

The last part, kart, is the main noun, and -et makes it definite, so the whole word means the room map / the space map, depending on context.

This is very common in Norwegian. Where English often uses several words, Norwegian often combines them into one:

• skolebok = school book
• togstasjon = train station
• forbudssone = forbidden zone / restricted zone

Because in Norwegian, the definite article is usually attached to the end of the noun.

So:

• et kart = a map
• kartet = the map

And:

• en sone = a zone
• sonen = the zone

That is why you get:

• romkartet = the room map / the space map
• forbudssonen = the forbidden zone / the restricted zone

So Norwegian often expresses the as a suffix, not as a separate word.

Because the two nouns have different genders.

In Norwegian:

• kart is a neuter noun: et kart
• sone is a common-gender noun: en sone

In the definite singular:

• et kart → kartet
• en sone → sonen

Since compounds take their gender from the last part:

• romkart behaves like kart, so it becomes romkartet
• forbudssone behaves like sone, so it becomes forbudssonen

Viser is the present tense of å vise, which usually means to show.

So:

• å vise = to show
• viser = shows / is showing

In this sentence:

• Romkartet viser forbudssonen.
• The map shows the forbidden zone.

Norwegian present tense is nice and simple because the verb does not change depending on the subject:

• jeg viser = I show
• du viser = you show
• han/hun viser = he/she shows
• de viser = they show

Yes. It follows the standard Norwegian main-clause pattern:

subject + verb + object

So:

• Romkartet = subject
• viser = verb
• forbudssonen = object

This is exactly the kind of word order English speakers would expect in a simple statement:

• The map shows the forbidden zone.

Yes.

It is made from:

• forbud = prohibition / ban
• sone = zone

Together, forbudssone means something like restricted zone, prohibited zone, or forbidden zone, depending on context.

Then the definite ending -en gives:

• forbudssonen = the restricted zone / the forbidden zone

So the full structure is:

• forbud
  • sone
    • -en

The indefinite forms are:

• et romkart = a room map / a space map
• en forbudssone = a forbidden zone / a restricted zone

Then the definite forms are:

• romkartet = the room map / the space map
• forbudssonen = the forbidden zone / the restricted zone

This is a useful pattern to learn:

• et kart → kartet
• en sone → sonen

You usually know from context.

In Norwegian, rom can mean:

• room
• space / outer space

So romkartet could theoretically mean:

• the room map
• the space map

The context, topic, or translation will tell you which meaning is intended. Since you said the meaning is already shown to the learner, that meaning is the one you should follow here.

It is capitalized because it is the first word of the sentence.

In Norwegian, common nouns are not normally capitalized just because they are nouns. So inside a sentence you would usually write:

• romkartet
• forbudssonen

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

A useful rule is that compound nouns are usually pronounced as one unit, with the main stress often falling early in the word, especially on the first element.

Very roughly:

• ROM-kartet
• for-BUD-sonen or sometimes with clear stress on the first compound element depending on speech rhythm

You do not pause between the parts the way you might in English if you were reading separate words. The whole compound flows together.

For a learner, the most important thing is:

1. say the whole compound as one word
2. keep the definite ending attached clearly: -et, -en

Yes, that is possible, but it is a slightly different structure.

Compare:

• forbudssonen = the forbidden/restricted zone

  • a compound noun

• den forbudte sonen = the forbidden zone

  • den
    • adjective + noun

Both can be natural, but they are built differently.

Your original sentence uses the compact compound-noun style that Norwegian often likes:

• Romkartet viser forbudssonen.

That makes it feel neat and direct.