Crossword Genius

Feature of Zambezi river I mark bad, a maelstrom (6,3)

Ross

I believe the answer is:

kariba dam

I'm a little stuck... Click here to teach me more about this clue!

'feature' is the definition.
I know nothing about this answer so I can't tell whether this works.

'zambezi river i mark bad a maelstrom' is the wordplay.
'i mark bad a' anagrams to 'KARIBA DAM'.
But, I'm not clear how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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