Rai Kamnanchul

Rai Kamnanchul sits on Highway 21 about 17 kilometres before Phetchabun town, near the Wang Chomphu junction — a working citrus orchard and fish farm, not the shopping district its category listing sometimes implies. The retail sheds selling its produce are just one part of a much larger agricultural operation that’s been running since 1936, when the farm’s founder started growing oranges here, drawn by the alluvial soil and groundwater along this stretch of the Pa Sak valley. The sweet, green-skinned Kamnanchul orange grown here became one of the region’s signature exports, and the farm now describes its orchards as covering around 1,200 acres and roughly 200,000 trees, about 90 percent orange and the remainder pomelo and tangerine.

Beyond the citrus, the farm runs fish ponds across a similarly large area and coordinates a mulberry silk-weaving network reported to involve around 2,600 farmers across 26 provinces. Visitors can walk the orchard rows, watch silk being reeled on traditional looms, and see the fish operation that supplies much of what ends up in the farm shop. It’s a working site rather than a staged demonstration — expect tractors, workers, and produce moving through rather than a polished visitor centre.

The farm shop stocks more than 200 products under the Rai Kamnanchul brand — fresh citrus in season, silk goods, honey, and the farm’s best-known item, fermented fish (pla ra), a staple condiment across Isan and the upper central plains. On-site food stalls serve regional dishes built around the same produce sold in the shop.

Watch out: This is farmland, not a shopping mall — footwear that can handle dust and uneven ground works better than city shoes, and the covered areas are limited outside the main shop building.

Entry is free, and the farm is open daily 08:30-16:30. It’s an easy stop if you’re driving Highway 21 between Saraburi and Lom Sak, and pairs naturally with other agricultural and cultural sites around Phetchabun town, including the agro-tourism farms around Nam Nao district further north if you’re spending more than a day in the area.