Okinawa and Ogasawara Insets

By default, jpmap transports Okinawa and Ogasawara into visible inset locations.

library(tidyverse)
library(jpmap)

plot_jpmap("prefecture") +
  labs(title = "Default map with Okinawa and Ogasawara insets") +
  theme(
    plot.title = element_text(face = "bold", color = "#001040")
  )

Remove One Inset

Use ogasawara = FALSE when you only want Okinawa moved.

plot_jpmap(
  "prefecture",
  ogasawara = FALSE
) +
  labs(title = "Okinawa inset only") +
  theme(
    plot.title = element_text(face = "bold", color = "#001040")
  )

Use okinawa = FALSE when you only want Ogasawara moved.

plot_jpmap(
  "prefecture",
  okinawa = FALSE
) +
  labs(title = "Ogasawara inset only") +
  theme(
    plot.title = element_text(face = "bold", color = "#001040")
  )

Adjust The Map Frame

Use xlim and ylim to set longitude/latitude limits. You can also set axis breaks and labels. This example keeps the main islands and Okinawa while dropping the Ogasawara inset.

plot_jpmap(
  "prefecture",
  ogasawara = FALSE,
  xlim = c(122, 149),
  ylim = c(28.5, 47),
  x_breaks = seq(125, 145, 5),
  y_breaks = seq(30, 45, 5),
  x_labels = function(x) paste0(x, "\u00b0E"),
  y_labels = function(y) paste0(y, "\u00b0N")
) +
  labs(title = "Main islands with Okinawa inset") +
  theme(
    plot.title = element_text(face = "bold", color = "#001040")
  )

Remove The Boxes

Set inset_boxes = FALSE to keep the transported islands but remove the visual frames. When boxes are shown, jpmap masks the ordinary main-panel graticules inside each box and draws local longitude/latitude lines for the transported island group. Those labels are the islands’ original coordinates, not the destination coordinates of the inset box.

plot_jpmap(
  "prefecture",
  inset_boxes = FALSE
) +
  labs(title = "Insets without boxes") +
  theme(
    plot.title = element_text(face = "bold", color = "#001040")
  )

Use Literal Geography

Set inset = FALSE to keep every geometry in its projected geographic location.

plot_jpmap(
  "prefecture",
  inset = FALSE
) +
  labs(title = "Projected map without transported insets") +
  theme(
    plot.title = element_text(face = "bold", color = "#001040")
  )

Control Disputed-Territory Shapes

Set territorial_disputes = FALSE to exclude areas discussed in Japan territorial-dispute references. You can also pass a character vector to include only selected regions, such as territorial_disputes = "senkaku" or territorial_disputes = c("senkaku", "takeshima").

Use disputed_fill, disputed_color, and disputed_dots = TRUE when you want to emphasize these small islands and reefs.

plot_jpmap(
  "prefecture",
  disputed_fill = "#005BAC",
  disputed_color = "#001040",
  disputed_dots = TRUE
) +
  labs(title = "Map with highlighted disputed-territory shapes") +
  theme(
    plot.title = element_text(face = "bold", color = "#001040")
  )

What The Boxes Mean

The inset boxes are visual guide frames for the transported island groups. They are sized to cover the Okinawa and Ogasawara source extents that jpmap transports into the default map frame. The longitude/latitude labels drawn inside a box describe the island group’s true coordinates before transport. The boxes themselves are still display frames, not legal boundary extents.

For Okinawa municipal maps, an available 2024 MLIT N03 Okinawa layer is transported as Okinawa. For Ogasawara, the default box also covers the remote Ogasawara pieces present in the available prefecture layer, such as Minamitorishima. Use inset = FALSE when literal geographic placement matters more than a compact display.

When territorial_disputes = TRUE includes Okinotorishima, the Ogasawara box is expanded so the Okinotorishima reef shape remains visible. These disputed-territory shapes are not official boundary polygons.