to meet by chance, run into

delta (landform at the mouth of a river)

flow / transpiring; events

place, location / site (location designated for some purpose) / space, room / a seat / (sumo) tournament

formation / Short for 形成手術.

form, take form

a sea, an ocean / a lake / (figuratively) an object covering over a large area, as in 血の海 (chi no umi, “pool of blood”) or 火の海 (hi no umi, “sea of fire”)

river, stream

river

river, stream, brook