On a hill above the Mekong River and beside the House of Opium is Wat Phra That Phu Khao (‘the temple on the hill’), founded in the 8th century by the king of the long vanished city-state of Wiang Hirannakhon Ngoen Yang.

The stone-built and restored viharn and several crumbling chedis are all that remains of this ancient temple, though few visitors show interest in the temple itself as this is the best spot in Sop Ruak from where to view and take photos of the majestic Mekong River and the Golden Triangle.

If you think that by being on land that belongs to a Buddhist temple, you’ll be spared the entreaties of vendors to buy their goods, then think again. The viewpoint over the confluence of the rivers and the meeting point of three countries is surrounded by souvenir shops selling T-shirts, maps and cold drinks, and young kids dressed in hilltribe gear will pose for a photo beside the ‘Golden Triangle’ sign, as long as you show your appreciation in monetary terms.

From Chiang Saen, take a songthaew north to Sop Ruak (20 minutes).

  • What is it? A hilltop temple with spectacular views over the Golden Triangle.
  • Opening hours: 06:00-18:00 daily.
  • Entrance fee: none.
  • Address: Just off Highway 1290
  • Where: on a hill above Sop Ruak’s market.