From Pathfinder Lost Omens High Seas, which isn't enabled.

Helm of the Tides

ITEM 11

Price 1200 gp

Usage worn headwear

Bulk L

This silvery, hydrodynamic helm features curling waves inscribed along its surface. You gain a +2 item bonus to Athletics checks to Swim.

Activate—Raise the Tide (manipulate)

Frequency once per day

Effect You cast Control Water. If you cast it at night, the spell's area becomes 100 feet long by 100 feet wide.

Pathfinder Lost Omens High SeasORC