Along Highway 4012 toward Phetchaburi, you’ll pass Thailand’s traditional sea salt farms—flat, shimmering fields divided into shallow ponds. Seawater is channeled in and left to evaporate under the intense sun, gradually concentrating into brine until salt crystals form.

Harvesting is simple but labor-intensive: workers rake the crystallized salt into small white piles, often by hand, creating striking geometric patterns across the fields. The best season is the dry months (roughly December–April), when clear skies speed up evaporation.

It’s not just industry—it’s a distinctive landscape. The bright salt mounds, reflective water, and open sky make this stretch a favorite for photographers and a glimpse into a centuries-old coastal livelihood.