Missing Secret Seashell in Link's Awakening Switch [RESOLVED]

[Fizzle]

I am trying to 100% this game, and I have checked every guide to find the 50th seashell. It appears to be the one marked above the River Rapids finish line in all of the guide maps, but I'm not sure what it means. I have gotten all the Racing rewards, including the one for clearing in 35 seconds. I need some help.

 

[Fizzle]

Resolved. I found the shell on a different map, so this thread is no longer needed