There is no tag for general sea-water related questions. The only tags up until now that come remotely close are sea-level, and sea-ice
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4$\begingroup$ Any user with reputation > 150 can create tags. If you want a sea-water added to a question that needs it, just comment on it and someone may add it. $\endgroup$ – gerrit♦ May 2 '14 at 18:41
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1$\begingroup$ Alternatively, dump a link here :-) $\endgroup$ – kaberett May 2 '14 at 20:12
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$\begingroup$ Yeah, and to add on to what @gerrit said: we don't create tags until there's a need for one. If there's a question that needs a tag, we'll create it, but we physically can't create a tag until there's a question that needs it. $\endgroup$ – hichris123♦ May 2 '14 at 20:20
