You can get the Day 2 Echoing Conch inside Kazuha's Domain in Genshin Impact.
ALL Phantasmal Conches locations Day 2 and 3 |QUICK GUIDE|
The Conch collectible from last year's Summertime Event returns in version 2.8. The concept remains the same even when the Conch locations vary: collecting enough Conches on the Golden Apple Archipelago event map will earn you a free character costume.
Conches in Genshin Impact look very similar to conches in real life. However, they emit a very small glimmer. It turns blue for Echoing Conches and purple/orange for Imaging Conches.
Most importantly, a white Conch icon will appear on the minimap as soon as you get close enough. On Day 2, you can only collect one Echoing Conch.