Kraison Siharat Hall (The Chub Sorn Lake Pavilion or Yen Pavilion)

Kraison Siharat Hall stands on a small island inside Thale Chubsorn, an artificial reservoir King Narai the Great had built outside old Lop Buri as both a water source and a retreat from the summer heat. Locals call it the “Yen Pavilion” (Phra Thinang Yen) — yen means cool, a reference to how much more bearable the temperature felt out on the water compared with the palace in town, 3 km away.

Experience

The pavilion itself predates 1685, built as a place for the king to relax rather than to govern from. Its real historical weight comes from one specific night: on 11 December 1685, King Narai used this site to observe a lunar eclipse together with French Jesuit priests and members of the first diplomatic mission Louis XIV sent to Siam. That joint observation is documented as one of the earliest astronomical records in Thai history, and it’s the detail that separates this pavilion from the dozens of other ruins scattered through Lop Buri.

Thale Chubsorn wasn’t just decorative water — it was Lop Buri’s original municipal reservoir, enclosed by a stone-and-mortar dam, with clay pipes running from it into the old town to supply drinking water. Standing at the pavilion, you’re looking at the origin point of the city’s first plumbing system as much as a royal folly.

Atmosphere & Timing

The site is quiet compared with the more visited palace complex in town — expect ruins and foundations rather than an intact building, with the reservoir itself the main visual anchor. Early morning or late afternoon avoids the worst of the heat, since there’s little shade on the open water.

Insider Tip: Visit as a pair with Phra Narai Ratchaniwet — they’re 3 km apart and tell one connected story about how King Narai split his time between governing from the palace and retreating to the water.

Watch out: This is a ruin, not a restored building — if you’re expecting an intact throne hall like the palace museum pieces in town, the scale here is smaller and more archaeological.

Practical

Kraison Siharat Hall is at Moo 6, Thale Chup Son subdistrict, about 3 km from Lop Buri’s old town. View on Google Maps. Combine it with King Narai National Museum and San Phra Kan for a full day covering the king’s palace, his shrine, and his summer retreat.