What is the longest river of Antarctica?

Aiken Creek
Alph River
Lawson Creek
Onyx River
The Onyx River is a meltwater stream, which flows westward through the Wright Valley from Wright Lower Glacier and Lake Brownworth at the foot of the glacier to Lake Vanda, during the few months of the Antarctic summer. At 32 kilometres in length it is the longest river in Antarctica.
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Aiken Creek
Alph River
Lawson Creek
Onyx River
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