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I notice that there is also a Category:Thames drainage basin which simply lists various tributaries and overlaps with this one. I can't see any logical difference in the two, though their current overlap is incomplete. I suggest a merge. Pterre (talk) 10:54, 25 August 2013 (UTC)[reply]
To clarify, Category:Thames drainage basin includes distributaries, while this category only apparently includes direct tributaries. However neither includes a full list of the streams within the drainage basin. Pterre (talk) 11:02, 25 August 2013 (UTC)[reply]