river delta
Geographical term for a triangular landform at a river mouth formed by sediment deposition.
The Nile River delta is a vast agricultural region.
I checked the shape of the delta on the map.
河口 means 'river mouth' in general, while 三角州 specifically refers to the triangular landform created by sediment at the mouth.
扇状地 is an 'alluvial fan' formed where a river flows onto a plain, while 三角州 is a 'delta' formed at a river mouth into a sea or lake.
Standard kanji spelling for 'river delta'.
Alternate kanji spelling using 洲 (sandbank, islet). Less common than 三角州.
Compound of 三角 (triangle) and 州 (sandbank, delta). The spelling 三角洲 uses 洲, a variant character also meaning sandbank or islet.