LF : Ship rope?

[KPHMPH]

Edit - found

[prae]

walmart, amazon, etc if online is acceptable. search for large twisted or braided polypropylene or nylon rope. or search "tug o war" ropes.

Found this on lowes.ca
https://www.lowes.ca/rope-string/lehigh-34-in-twisted-nylon-bulk-rope-by-the-foot_g1428396.html?SearchTerm=twisted-nylon-bulk-rope


If there are any marine supply places in town, you are right, "docklines" are what you're seekin

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http://www.canadiantire.ca/en/pdp/shoreline-double-braided-nylon-marine-dock-lines-white-0793703p.html

[The Cosworth]

Not sure how thick your thinking but if you truly want marine grade try the guys at Martin Marine. They have some big boats. If not, can try a boat dealer in BC as they'd have ocean going vessels.

If you don't need something exactly that thick, but thicker, try Ackland's or Princess Auto.