Multiple choice general knowledge

The term originates from the fourth letter of the Greek alphabet. It refers to the wide triangle-shaped part of the river where it meets the lake or the sea. What is it called?

  1. Delta

  2. Canyon

  3. Lagoon

  4. Tsunami

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A Correct answer
Explanation

Delta is the fourth letter of the Greek alphabet (Δ). River deltas are named for this letter because of their characteristic triangle shape where rivers deposit sediment at their mouths.