三角州

• Reading: さんかくす
• Romaji: sankakusu
• Kanji breakdown: 三 (san) — three; 角 (kaku) — angle, corner; 州 (su/shuu) — sandbar, state
• Pronunciation: /saŋ.ka.kɯ.sɯ/

Meaning

Delta; river delta. The fan-shaped landform deposited at the mouth of a river where it flows into a sea, lake, or ocean.

A noun used in geography and earth science contexts. Formed by the accumulation of sediment over thousands of years, deltas are typically fertile and heavily populated regions. The term directly maps to the Greek letter delta (Δ) due to the triangular shape of these formations.

Examples

1. ナイル川の三角州は世界最大級の肥沃な土地として知られている。 The Nile Delta is known as one of the world's largest and most fertile landforms.
2. 長い年月をかけて土砂が堆積し、河口に広大な三角州が形成された。 Over many long years, sediment accumulated and formed a vast delta at the river's mouth.
3. その三角州には豊富な水資源があり、多くの生物が生息している。 The delta has abundant water resources and supports a wide variety of living organisms.

Usage Guide

Context: geography, earth science, education

Tone: academic

Origin & History

Compound of 三角 (triangle) and 州 (sandbar, islet). A calque of the English and French word 'delta,' named after the triangular shape resembling the Greek letter Δ.

Cultural Context

Era: Modern

Generation: Adults

Social background: Academic