let's say i have a piece of land in latin america... what is the best way of taking an overcollateralized onchain loan against that land?

Depends. Assuming the land registry is NOT on-chain, then you will probably have to have land held by SPV. And for the SPV, it will depend on what country you are in. Is land ownership real ownership or leasehold? Is foreign ownership possible? Each LatAm jurisdiction is different.

DeFi, Blockchain, Digitization, Biofuels, 
Mozambique

The land registry is not onchain. Are there any land registries that are?

Real ownership of the land.

Best jurisdiction to put the land into an SPV?

And who will then tokenise the spv and issue a loan against it?

I’m investigating this too. Top contenders for the SPV jurisdiction are

US
BVI
Cayman
Costa Rica

All depends on who you want the investors to be in the tokenized SPV. We can help with this btw, let’s meet! Got a booking link I could find a time on?

Productising RWAfi @plumenetwork. Building https://transferagentprotocol.xyz on it. Hosting /rwa and /plume and /nest

Apologies for the delay here. I'm working on my own, can share if that's useful. Criteria is

- stable regulation with strong privacy
- pass-through tax
- moderate compliance requirements
- corporations can be shareholders
- established regulation 
- used my many international entities

For example

Digital Transformation for the Financial Services sector.

Is there some reliable table available to compare those jurisdictions and to explain why they are top contenders that you know of ?

Do you mean something like a credit protocol? Not fully following the end of that sentence

Also keen to understand who top contenders are with regards to making the tokenised SPVs worthwhile onchain collateral with liquidity