Im trying to plot from Madagascar to America, but there is a problem… just a gray line in the map.

Here is the code:

basemap = basemap(limit= c(40, -70, -37 ,40), rotate= T, grid.col = NA, land.col = "lightgray")+
  xlab("Longitude")+
  ylab("Latitude")+
  theme(
    axis.text = element_text(colour="black", size=10),
    axis.title = element_text(colour="black", size=12),
    panel.background = element_rect(fill="lightblue"),
    panel.ontop = F,
    panel.border = element_rect(fill = NA, colour = "black", size = 0.1),
    panel.grid.minor = element_line(colour="grey90", size=0),
    panel.grid.major = element_line(colour="grey90", size=0),
    legend.text = element_text(size=12),
    legend.title = element_blank(),
    legend.key.size = unit(0.7, "cm"),
    legend.position = "top"
  )
basemap

I need the whole Indian and Pacific oceans in the same map.