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Map in R, how do I draw a map of Baltimore?

I'm trying to make the Shiny app, and part of it consists of the plot of the city of Baltimore, and as soon as I do this, I will print other data on this map.

I try "rworldmap", "raster" and "ggmap", but I don’t understand how to set the right parameters to make it work, the time when I was closer is the following:

library(rworldmap)
newmap <- getMap(resolution = "low")
plot(newmap)
library(rworldmap)
newmap <- getMap(resolution = "low")
plot(newmap)

plot(newmap,
  xlim = c(-39.3750, -76.7226),
  ylim = c(39.1800, -76.5254),
  asp = 1
)

It seems to me the region of South America, and ... upside down: S

The latitude and longitude in theory should be something like this: (39.371846, -76.720619) (39.198588, -76.491280)

Does anyone know how to continue this?

Sorry for my English,

Thank!:)

PS: If this can help, then what I will print later will be the coordinates.

+4
1

ggmap:

library(ggmap)
map <- get_map(location = 'Baltimore', zoom = 12)
ggmap(map)
+6

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