Word analogy: river and the country it flows in or rises in

This type of question, asked 2 times: 9 Sep 2024 S2, 12 Sep 2025 S1. All 2 questions below, oldest first.

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Question 1
9 Sep 2024 S2
10 $Select the word-pair that best represents a similar relationship to the one expressed in the pair of words given below. (The words must be considered as meaningful English words and must NOT be related to each other based on the number of letters/number of consonants/vowels in the word) Egypt : Nile$
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Question 2
12 Sep 2025 S1
2 $In the following question, select the related word from the given alternatives. Mekong : Tibet :: Amazon : ?$
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Question 1