Where's the longest bit of coastline between two ports (south of the Arctic Circle)?

I was going to say Walvis Bay to Capetown (1273km as the crow flies). Ludertiz is supposedly pretty shallow and only fishing boats dock there.

as you may imagine, defining coastline is quite difficult. The coastline of Rhode Island is huge for example. Do you count every little indentation? Do you skip the mudflats? Perhaps you are asking for the sailing distance between ports on a given landmass. That is available. The government (NGA for the world) publishes a book listing the distance between ports and major navigation junctions. In fact it is available on the internet:
http://msi.nga.mil/NGAPortal/MSI.portal;jsessionid=SszLMd5fv01Gv6nJzJkkSh2rT9J4lp2M3VnGvVVh6n1pTgzpylHw!251225267!NONE?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0005

If you want to limit yourself to the US, NOS publishes:
http://www.nauticalcharts.noaa.gov/nsd/distances-ports/

But these distances are as the ship sails, not the coastline distance. Like a fractal, the length of a coastline depends on the resolution. Until you define that, you won’t come up with an answer.

I see now that several people have discussed these issues. Nevertheless, one can’t answer the OP without some definitions. The cites given here and in the other replies provide some definitions.

It’d have to be Walvis Bay to Saldanha Bay (1170km in a straight line). The Port of Saldanha is a major bulk iron ore and crude oil port, so I think it would have to count for this purpose.

That site indicates a long portless stretch of coast on the southern coast of Australia, between a small port in Western Australia and an small port in South Australia.

That would be the Esperance-Ceduna stretch mentioned in Post #7.

Although I’m pretty convinced the Hudson Bay one is probably the longest, I was thinking about Baja California. Is there a port between Cabo San Lucas and Ensenada? There’s Guerro Negro, but I don’t think it’s a port. So that’s probably close to a 1000 miles.

Then there is Loreto going north to at least San Felipe. Does anyone know where the next port is on the west coast of the Mexican mainland?

Yeah, racist humor at the expense of First Nations, by intentional vulgar deformation of the original Innu name. When things like this are called out as racist, the usual attitude is like Come on, Indians, what’s the matter, don’t you have a sense of humor?

ETA-- A comparable 17th-century example concerns the coffee-producing town of Bayt al-Faqih in Yemen. British coffee merchants amused themselves by spelling it “Beetlefuckee.” Why not make fun of the funny little brown people and their funny sounding languages, after all..

Also, we usually spell it “Sheshatshiu” these days. So not only is it an inappropriate bit of humour at the expense of a community that’s suffered extreme hardship over the last decades, it’s one that’s out of date.

Pronounced [ʃehatʃju] — approximately shay-hatch-you.