readOGR() cannot open file

You could have shown that you have the right path with:

list.files('~/R/funwithR/data/ne_110m_land', pattern='\\.shp$')
file.exists('~/R/funwithR/data/ne_110m_land/ne_110m_land.shp')

perhaps try:

readOGR(dsn=path.expand("~/R/funwithR/data/ne_110m_land"), layer="ne_110m_land")

or a simpler alternative that is wrapped around that:

library(raster)
s <- shapefile("~/R/funwithR/data/ne_110m_land/ne_110m_land.shp")

Update:

rgdal has changed a bit and you do not need to separate the path and layer anymore (at least for some formats). So you can do

x <- readOGR("~/R/funwithR/data/ne_110m_land/ne_110m_land.shp")

(perhaps still using path.expand)

Also, if you are still using readOGR you are a bit behind the times. It is better to use terra::vect or sf::st_read.

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