How to join a DF object and a SF object ?

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Dear @ LINALGBS,

unfortunately it is very difficult to understand where the problem is.
you can you maybe try this,

region_sf <- sf::st_transform(x = NIC, crs = 4326)

But indeed we need to have a reprex in order to understand how to help you.

Have a look at FAQ: How to do a minimal reproducible example ( reprex ) for beginners

Best