Collocations for harbour - noun

deep, deep-water
good, safe, sheltered
natural
busy
picturesque, pretty
fishing

have
The town has a small natural harbour.

come into, enter, go into
They entered the harbour with flags flying.

go out of, leave

defences/defenses, wall
town
area
entrance, mouth (BrE)
authority (BrE), master

in (a/the) harbour
The fishing fleet is in harbour.
the activity in the harbour

into (a/the) harbour
The damaged vessel was towed into harbour.

out of a/the harbour
We sailed out of the harbour at daybreak.

the entrance to a harbour, the mouth of a harbour

Harbour/harbor is used after these nouns:
fishing