I see your point, but I want you to consider that the Dutch built many dykes and recovered quite a bit of land without the use of electricity, steam engines, or internal combustion engines.  Technology has marched on, but they did it with shovels and windmills to start with.

 

23 hours ago, impulse said:

They could probably learn a lot, and maybe even recover some land.  But can they afford it?

 

Thailand's GDP/ square km is $3 million USD

Netherlands GDP/ square km is $38.4 million USD

 

You have to dig into the data and do one more calculation, but here's my source:

 

 

Population density vs. GDP per capita, 2023

 

https://ourworldindata.org/

 

That's why 1st world solutions often don't work in the 3rd world.

 

 

 

 

 

 

To contain coastal erosion they could try planting a mangrove forest.  The under-water roots of mangrove trees are extensive, as anyone who has walked bare-foot through such water will be painfully aware.

 

Krung Thep was located on a low-lying swamp for reasons of security, after the destruction of Ayudhaya.  Even in quite recent times, before many canals were filled in to make roads, it was known as 'The Venice of the East'.

 

The reasons for Bangkok being where it is no longer exist.  The sooner plans are made to initiate a gradual relocation, the better it will be for future generations of Thais.