Collection of 13 of my favorite giant surface sulfur caves i found so far. Seeds are on screenshots and in the post description.

Seeds:

1: 25783843040

2: 17825001432

3: 48207397359

4: 15567686105

5: 47931904459

6: 12485884221

7: 4568606673

8: 24891895655

9: 21463559840

10: 48097697060

11: 48216500132

12: 41785090966 LARGE BIOMES

13: 48400430019 LARGE BIOMES