What is the longest distance by car ferry?

Question

I just noticed that there is a ferry from mainland spain to Tenerife. I already knew of the ferry to Iceland.

My question is if there are ferries that travel longer distances than these two?

Cadiz–La Palma is slightly longer than Portimao–Tenerife. Can there be intermediate stops?
Yes intermediate stops are accepted. The route to Iceland stops on the farroerislands
How often should it go to be considered a ferry? The 2219 km I found is just three times a year, so maybe it doesn't really count. Bergen–Kirkenes does, but it does a much longer distance than driving would, and is closer to a cruise-ship than to a ferry in practice.

gerrit · Accepted Answer · 2012-07-19 12:41:34Z

Some crossings that are longer than 1000 km, as the crow flies:

Travemünde–Helsinki: 1095 km
Cadiz–La Palma: 1382 km
Hirsthals–Seyðisfjörður: 1504 km
Alaska Marine Highway has some long routes: Selgovia–Dutch Harbor (1096 km), Bellingham–Skagway (1451 km). But nothing beats Bellingham–Homer with 2219 km. Question is if this is still a ferry considering it doesn't go very often (apparently just three times a year).
Norwegian Hurtigruten takes cars: Bergen–Kirkenes which is 1541 km as the crow flies, but at least twice as long with the route it actually takes.

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