Should one go to a river to say Tashlich on Rosh Hashanah, and what are the requirements?

Synopsis

The Rema records the custom of going to a river and saying the verse from Micah 7:19. The Mishnah Berurah elaborates that it should preferably be a place with live fish, outside the city, on the first day after Mincha before sunset. The Gra explains it commemorates the akeida. The Aruch HaShulchan records the practice but notes concerns about mixed-gender gatherings.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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