mn_admin: Administrative boundaries of Mongolia at any level

In mongolmaps: Maps and Administrative Boundaries of Mongolia and Ulaanbaatar

Administrative boundaries of Mongolia at any level

Description

The engine behind mn_country(), mn_regions(), mn_aimags(), mn_soums(), mn_khoroos() and mn_bags(). Every function returns the same columns, so maps from different levels can be combined and joined in the same way.

Usage

mn_admin(
  level = "aimag",
  within = NULL,
  resolution = c("low", "high"),
  lang = NULL,
  crs = NULL
)

Arguments

level	The level to return: "country": Mongolia. "region": the five economic regions used by NSO (Western, Khangai, Central, Eastern, Ulaanbaatar). "aimag": the 21 aimags (provinces) and the capital, Ulaanbaatar. "soum": the 330 soums and the 9 districts (duureg) of Ulaanbaatar. "bag": the 204 khoroos of Ulaanbaatar, plus rural bags if you have registered a bag boundary file (see mn_bags()). Synonyms such as "province", "district", "adm1" or "khoroo" also work.
within	Keep only units inside these places, or these places themselves: names or codes of any level, such as "Khovd", "MN84" or "Western region".
resolution	"low" (default) uses simplified boundaries that ship with the package and suit most maps. "high" uses full-resolution boundaries, downloaded once (about 10 MB) and cached; see mn_cache_dir().
lang	Language of the name column: "en" (English, as in NSO tables), "mn" (Cyrillic) or "mns" (Latin with diacritics, MNS 5217). Defaults to getOption("mongolmaps.lang", "en").
crs	Coordinate reference system of the result. NULL (default) keeps longitude/latitude (EPSG:4326). Use "albers", "lcc" or "utm" for a projection suited to Mongolia (see mn_crs()), or any value accepted by sf::st_crs().

Value

An sf tibble with one row per unit and the columns:

pcode

Unique code (see mn_codes()).

name

Name in the language chosen with lang.

name_en, name_mn, name_mns

English, Cyrillic and MNS Latin names.

level, type

Level ("aimag", "soum", ...) and type ("capital", "district", "khoroo", ...).

number

Bag or khoroo number within its soum or district.

iso_code

ISO 3166-2 code (aimags only).

nso_code

Code used in NSO statistical tables.

parent_pcode, region_pcode, aimag_pcode, soum_pcode

Codes of the units that contain this one.

area_km2

Area in square kilometres, computed from the full-resolution boundary.

geometry

Multipolygon boundary.

See Also

Other admin boundaries: mn_aimags(), mn_bags(), mn_country(), mn_soums(), mn_ub()

Examples

mn_admin("aimag")
mn_admin("soum", within = "Khovd")
mn_admin("aimag", within = c("Khovd", "Uvs"), lang = "mn")

mongolmaps documentation built on Oct. 10, 2026, 5:08 p.m.