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How to do tashlich
Look for a natural body of water that you can access easily.
Tashlich requires that you cast your sins into a body of water like a river, spring, lake, pond, or well. Most people prefer natural, flowing bodies of water because it gives the effect of your sins being swept away by the current, as god promised.
If you're having trouble finding a place to perform tashlich, talk to your rabbi about potential places near the synagogue or your hometown. They might be able to direct you to a place within walking distance.