West Harbor is a village in the NWN2 official campaign.
The player character starts off as a villager in West Harbor. It's not very aptly named because it's in the middle of a dangerous monster-ridden swamp. Harbormen are hearty folk -- they have to be with all the lizardfolk running about. This village is basically the PC's hometown.
Spoiler warning: Plot and/or ending details follow.
It is destroyed later on in the campaign by the forces of the King of Shadows. It also proves to be the site where the PC must reforge the Sword of Gith.
Depending upon whether the PC sided with the King of Shadows, the village will stay destroyed or will be rebuilt.
In Storm of Zehir
West Harbor appears again in Neverwinter Nights 2: Storm of Zehir, restored after the defeat of the King of Shadows. Its housing area is now reinforced with a stockade and guards.
The dragons Voarag and Waervaer have kidnapped Tarmas, and later infiltrate the village by disguising themselves as its residents and seize power in it. The party has an option of either siding with the dragons, or killing them and freeing West Harbor.
Even if the player imports a character from the first (and perhaps second) campaigns, the game will still treat them as if they have never been to West Harbor before, despite having history feats showing that they are from there.