The Ironwoods of Khlong Lot

over 217 years (planted during King Rama I's reign, 1782-1809)Thai Ironwoodpin approximate

The Ironwoods of Khlong Lot
Photo: กสิณธร ราชโอรส, via Wikimedia Commons (CC BY-SA 4.0)
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Five ironwood trees standing over a Bangkok canal are, in effect, a two-century-old weapons reserve nobody ever needed to use again. King Rama I ordered Thai ironwood planted along Khlong Lot shortly after founding Bangkok in 1782, part of a hardwood stockpile meant to build warships for a kingdom still fighting Burma on a near-annual basis. Ironwood's real advantages, dense grain, genuine rot-resistance, and enough buoyancy once cut to float downriver, made it the standard timber for Siamese naval construction, and someone in the new capital planted with fleets in mind rather than gardens. The trees outlasted every war they were grown for and most of what came after: seven remained by 1998, five by 2019, worn down by two centuries of city growth rather than by axes. Thai folk belief holds that timber cut for shipbuilding carries its own protective spirit into the vessel, called Chao Mae Takian, so wood taken from here would once have gone to sea as more than lumber. In December 2021, Bangkok's environmental office joined a heritage-tree foundation, the Ministry of Defence and three professional associations to formally restore what remains, an unusually wide coalition for five trees behind a temple most visitors walk straight past on the way to something older-looking. They still stand exactly where Rama I put them, doing nothing more useful now than being two hundred years old.

The buttons above open directions and check-ins. 10 minute walk from MRT Sanam Chai (Blue Line), via Atsadang Road

The pin marks the right spot roughly, not the tree itself. It stands here, but we have not confirmed the precise position on the ground yet. Know exactly where it is?

Species
Thai Ironwood (Hopea odorata)
Age estimate
over 217 years (planted during King Rama I's reign, 1782-1809)
Location
Khlong Lot canal, Atsadang Road, behind Wat Ratchabophit, Phra Nakhon, Bangkok (Phra Nakhon, Rattanakosin Island)
Access
Free, public canal-side street, viewable at any time
Getting there
10 minute walk from MRT Sanam Chai (Blue Line), via Atsadang Road

Trees nearby

The Bodhi Tree of Wat Phra Kaewplanted 1864, about 162 years · 570 m awayLan Pho, the Bodhi Tree of Thammasat Universityat least 90 years, exact planting date undocumented · 1.0 km awayThe Bodhi Tree of Wat Saketplanted 1818, about 208 years · 1.3 km away
Curious what else is standing in Bangkok? See all 5 remarkable ancient trees in Bangkok or find out what the oldest tree in Bangkok is.
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