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Oh and trains too:
https://energynewsbeat.com/crude-oil/how-effective-is-the-iran-back-door-rail-line-to-china/
https://www.jfeed.com/news-world/iran-china-oil-rail-exports
https://fountainbridge.substack.com/p/china-iran-rail-corridor

> The rail corridor between Iran and China has been operational since around May 2025. It can shorten transit times to roughly 12–15 days compared to 30–40 days by sea, but volumes remain limited compared to tanker shipments.