jmdict 2860121 Active (id#2291154)
合流点
【 ごうりゅうてん 】
  1. [n]
    • confluence (of rivers)
    • junction (of rivers, roads, etc.)
    • meeting point
    Cross references:
    • ⇐ see: 2860122 合流地点【ごうりゅうちてん】 1. confluence (of rivers); junction (of rivers, roads, etc.); meeting point (of civilizations, etc.)
History:
    • A 2024-02-05 21:59:16 Jim Breen (id#2291154)
    • Refs
      GG5, etc.
    • A* 2024-02-05 21:53:28 Brian Krznarich (id#2291153)
    • Comments
      We have an ample number of 〇〇点 entries, it doesn't seem this should be out of place.

It does seem that both 合流 and 合流点 can potentially just mean "confluence", but if you look at the math in the refs, it would seem that an explicit reference to the physical junction point of two rivers ("a confluence") is more likely to be either of  合流点 or 合流地点 than just 合流 alone.
    • Refs
      daijs
https://kotobank.jp/word/合流点-497876
二つ以上の川の流れなどが合流する地点。 <-- looks like "confluence"

https://eow.alc.co.jp/search?q=合流点
合流点
confluence（2本以上の川の）
junction（道路・川などの）
meeting point

ハイテクと娯楽の合流点   <--- a more figurative use
junction of high technology and entertainment


合流	2380342	96.6%
合流点	85039	3.4%

But....

川の合流	15349	  
川の合流点	7221	  
川の合流地点	4386	
川の合流する	1532	<---
So, of 15349 ngrams 11607 are definitely taken by 川の合流点 or 川の合流地点, and 1532 are definitely verbal, so at *maximum* 2200 standalone 合流 occurrences couple possibly be the noun "confluence", which is way less than this term.


Top collocations of 合流　(largely verbal):
合流	2380190	  
合流し	899341	 verb 
合流して	400117	 verb
合流する	289060	 verb
合流した	158485	 verb
合流点	84993	 this entry
合流地点	45474	 synonym for this entry

合流点
confluence（2本以上の川の）
junction（道路・川などの）
meeting point

https://ja.wikipedia.org/wiki/合流点
合流点
河川が合流する地点。
「:en:confluence」も参照
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