diff --git a/bin/omarchy-iso-make b/bin/omarchy-iso-make
index 5dbbeff..500de4b 100755
--- a/bin/omarchy-iso-make
+++ b/bin/omarchy-iso-make
@@ -6,8 +6,17 @@ NO_CACHE=""
 KEEP_PKG_CACHE=""
 LOCAL_OMARCHY_PATH=""
 LOCAL_PKGS_PATH=""
+OMARCHY_REGION="${OMARCHY_REGION:-global}"
 while [[ $# -gt 0 ]]; do
   case $1 in
+  --region)
+    OMARCHY_REGION="${2:-}"
+    if [[ $OMARCHY_REGION != "global" && $OMARCHY_REGION != "cn" ]]; then
+      echo "Error: --region requires global or cn (ISO 3166-1 alpha-2)." >&2
+      exit 1
+    fi
+    shift 2
+    ;;
   --no-cache)
     NO_CACHE=1
     shift
@@ -57,12 +66,17 @@ while [[ $# -gt 0 ]]; do
     ;;
   *)
     echo "Unknown option: $1"
-    echo "Usage: $0 [--no-cache] [--keep-pkg-cache] [--no-boot-offer] [--debug] [--edge] [--dev|--rc] [--local-source <omarchy-checkout> <pkgs-checkout>]"
+    echo "Usage: $0 [--no-cache] [--keep-pkg-cache] [--no-boot-offer] [--debug] [--edge] [--dev|--rc] [--region global|cn] [--local-source <omarchy-checkout> <pkgs-checkout>]"
     exit 1
     ;;
   esac
 done
 
+if [[ $OMARCHY_REGION != "global" && $OMARCHY_REGION != "cn" ]]; then
+  echo "Error: unsupported region '$OMARCHY_REGION'. Expected global or cn." >&2
+  exit 1
+fi
+
 if [[ -n $LOCAL_OMARCHY_PATH ]]; then
   [[ -d $LOCAL_OMARCHY_PATH ]] || { echo "Error: Omarchy checkout not found at $LOCAL_OMARCHY_PATH" >&2; exit 1; }
   [[ -d $LOCAL_PKGS_PATH ]]    || { echo "Error: pkgs checkout not found at $LOCAL_PKGS_PATH" >&2; exit 1; }
@@ -125,6 +139,7 @@ DOCKER_ARGS=(
   --privileged
   -e "OMARCHY_ISO_REF=$OMARCHY_ISO_REF"
   -e "OMARCHY_MIRROR=$OMARCHY_MIRROR"
+  -e "OMARCHY_REGION=$OMARCHY_REGION"
   -e "OMARCHY_INSTALL_DEBUG=${OMARCHY_INSTALL_DEBUG:-}"
   -e "HOST_UID=$(id -u)"
   -e "HOST_GID=$(id -g)"
@@ -146,10 +161,14 @@ if [[ -d /var/cache/pacman/pkg ]]; then
   DOCKER_ARGS+=(-v "/var/cache/pacman/pkg:/var/cache/pacman/pkg")
 fi
 
-# Mount the build cache directory where packages are downloaded. Channels use
-# different package snapshots and must never share an offline mirror cache.
+# Channels and regions must not share an offline mirror cache. Keep the
+# existing global cache path and artifact suffix unchanged.
+region_suffix=""
+if [[ $OMARCHY_REGION != "global" ]]; then
+  region_suffix="-$OMARCHY_REGION"
+fi
 if [[ -z "$NO_CACHE" ]]; then
-  OFFLINE_REPO_BUILD_CACHE_DIR="$HOME/.cache/omarchy/iso_${OMARCHY_MIRROR}/airootfs/var/cache/omarchy"
+  OFFLINE_REPO_BUILD_CACHE_DIR="$HOME/.cache/omarchy/iso_${OMARCHY_MIRROR}${region_suffix}/airootfs/var/cache/omarchy"
   mkdir -p "$OFFLINE_REPO_BUILD_CACHE_DIR"
   DOCKER_ARGS+=(-v "$OFFLINE_REPO_BUILD_CACHE_DIR:/var/cache/airootfs/var/cache/omarchy")
 else
@@ -169,7 +188,7 @@ fi
 "${DOCKER[@]}" run "${DOCKER_ARGS[@]}" archlinux/archlinux:latest /$BUILD_SCRIPT
 
 latest_iso=$(\ls -t "$BUILD_RELEASE_PATH"/*.iso | head -n1)
-iso_ref="${latest_iso%.*}-$OMARCHY_ISO_REF.iso"
+iso_ref="${latest_iso%.*}-${OMARCHY_ISO_REF}${region_suffix}.iso"
 mv -f "$latest_iso" "$iso_ref"
 
 if [[ -z "${NO_BOOT_OFFER:-}" ]]; then
diff --git a/builder/build-iso.sh b/builder/build-iso.sh
index 0c917d6..5224eef 100755
--- a/builder/build-iso.sh
+++ b/builder/build-iso.sh
@@ -4,6 +4,11 @@ set -e
 
 OMARCHY_ISO_REF="${OMARCHY_ISO_REF:-quattro}"
 OMARCHY_MIRROR="${OMARCHY_MIRROR:-stable}"
+OMARCHY_REGION="${OMARCHY_REGION:-global}"
+case "$OMARCHY_REGION" in
+  global|cn) ;;
+  *) echo "Unsupported region: $OMARCHY_REGION" >&2; exit 1 ;;
+esac
 
 # Edge, dev, and local-source ISOs install the dev packages explicitly. Those
 # package recipes track the quattro branch. This avoids relying on pacman's
@@ -67,6 +72,7 @@ cp -r /configs/* "$build_cache_dir/"
 mkdir -p "$build_cache_dir/airootfs/usr/share/omarchy-iso"
 echo "$OMARCHY_MIRROR" > "$build_cache_dir/airootfs/root/omarchy_mirror"
 echo "$OMARCHY_ISO_REF" > "$build_cache_dir/airootfs/root/omarchy_iso_ref"
+echo "$OMARCHY_REGION" > "$build_cache_dir/airootfs/root/omarchy_region"
 cat > "$build_cache_dir/airootfs/usr/share/omarchy-iso/package-targets" <<EOF
 OMARCHY_RUNTIME_PACKAGE=$OMARCHY_RUNTIME_PACKAGE
 OMARCHY_SETTINGS_PACKAGE=$OMARCHY_SETTINGS_PACKAGE
@@ -80,6 +86,7 @@ if [[ ${OMARCHY_INSTALL_DEBUG:-} == "1" ]]; then
     echo "built_at=$(date -Is)"
     echo "ref=$OMARCHY_ISO_REF"
     echo "mirror=$OMARCHY_MIRROR"
+    echo "region=$OMARCHY_REGION"
     echo "runtime_package=$OMARCHY_RUNTIME_PACKAGE"
     echo "settings_package=$OMARCHY_SETTINGS_PACKAGE"
     echo "nvim_package=$OMARCHY_NVIM_PACKAGE"
@@ -139,6 +146,7 @@ sed -i -E '/^(linux|broadcom-wl)$/d' "$build_cache_dir/packages.x86_64"
 # already in the mirror and we filter them out below. Without it, pacman -Syw
 # pulls the published omarchy* from the network mirror like any other package.
 if [[ -d /omarchy-source ]]; then
+  runtime_root=/omarchy-source
   base_pkg_lists=(/omarchy-source/install/omarchy-base.packages /omarchy-source/install/omarchy-other.packages)
   setup_form=/omarchy-source/install/provisioning/setup-form.sh
 else
@@ -155,6 +163,14 @@ else
   fi
   mkdir -p /tmp/omarchy-pkglists
   bsdtar -xf "$omarchy_pkg" -C /tmp/omarchy-pkglists usr/share/omarchy/install/omarchy-base.packages usr/share/omarchy/install/omarchy-other.packages
+  runtime_root=/tmp/omarchy-pkglists/usr/share/omarchy
+  if [[ $OMARCHY_REGION != "global" ]]; then
+    if ! bsdtar -xf "$omarchy_pkg" -C /tmp/omarchy-pkglists \
+      "usr/share/omarchy/default/regions/$OMARCHY_REGION" usr/share/omarchy/bin/omarchy-apply-pacman; then
+      echo "ERROR: runtime lacks region support; publish a matching runtime or use --local-source." >&2
+      exit 1
+    fi
+  fi
   base_pkg_lists=(/tmp/omarchy-pkglists/usr/share/omarchy/install/omarchy-base.packages /tmp/omarchy-pkglists/usr/share/omarchy/install/omarchy-other.packages)
   # Extracted on its own, tolerating a miss: bsdtar exits non-zero for a member
   # it can't find, so asking for this alongside the package lists would abort the
@@ -168,6 +184,15 @@ mkdir -p "$build_cache_dir/airootfs/usr/share/omarchy-iso"
 cp "${base_pkg_lists[0]}" "$build_cache_dir/airootfs/usr/share/omarchy-iso/omarchy-base.packages"
 cp "${base_pkg_lists[1]}" "$build_cache_dir/airootfs/usr/share/omarchy-iso/omarchy-other.packages"
 
+# Work on writable copies, leaving the mounted runtime and ISO configs intact.
+online_config=/tmp/omarchy-pacman-online.conf
+cp "/configs/pacman-online-${OMARCHY_MIRROR}.conf" "$online_config"
+bash /builder/prepare-region.sh "$OMARCHY_REGION" "$runtime_root" "$build_cache_dir/airootfs" "$online_config"
+base_pkg_lists=(
+  "$build_cache_dir/airootfs/usr/share/omarchy-iso/omarchy-base.packages"
+  "$build_cache_dir/airootfs/usr/share/omarchy-iso/omarchy-other.packages"
+)
+
 # The configurator's setup form comes from the runtime this ISO bundles, so the
 # installer and the first-boot setup that finishes a deferred install can never
 # disagree. A runtime predating the split ships no such file, which would leave
@@ -232,7 +257,7 @@ fi
 
 mkdir -p /tmp/offlinedb
 download_offline_packages() {
-  pacman --config /configs/pacman-online-${OMARCHY_MIRROR}.conf --noconfirm -Syw \
+  pacman --config "$online_config" --noconfirm -Syw \
     "${all_packages[@]}" --cachedir "$offline_mirror_dir/" --dbpath /tmp/offlinedb --needed
 }
 
@@ -250,7 +275,7 @@ fi
 # newest version of every cached package name) removes packages that have left
 # the lists or dependency closure, such as an old Electron major version.
 if ! resolved_package_files="$(
-  pacman --config "/configs/pacman-online-${OMARCHY_MIRROR}.conf" --noconfirm \
+  pacman --config "$online_config" --noconfirm \
     --dbpath /tmp/offlinedb -S --print --print-format '%f' "${all_packages[@]}"
 )"; then
   echo "ERROR: could not resolve the package files required by the offline mirror" >&2
diff --git a/builder/prepare-region.sh b/builder/prepare-region.sh
new file mode 100644
index 0000000..2707fba
--- /dev/null
+++ b/builder/prepare-region.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+# Add the selected runtime's regional payload to the ISO. Repository defaults
+# stay in the runtime package, not in a second set of ISO-specific templates.
+set -euo pipefail
+
+region="$1"
+runtime="$2"
+iso_root="$3"
+online_config="$4"
+
+case "$region" in
+  global) exit 0 ;;
+  cn) ;;
+  *) echo "Unsupported region: $region" >&2; exit 1 ;;
+esac
+
+profile="$runtime/default/regions/$region"
+if [[ ! -f $runtime/bin/omarchy-apply-pacman || ! -f $profile/packages ||
+      ! -f $profile/pacman/pacman.conf.append || ! -f $profile/pacman/mirrorlist.append ]]; then
+  echo "Runtime does not support region '$region'; publish a matching runtime or use --local-source." >&2
+  exit 1
+fi
+
+# This is the target package list used both for download resolution and by the
+# installer. Merely putting extra packages in the cache would not install them.
+payload="$iso_root/usr/share/omarchy-iso"
+cp -a "$profile" "$payload/region"
+printf '\n' >> "$payload/omarchy-base.packages"
+cat "$profile/packages" >> "$payload/omarchy-base.packages"
+
+# Only the community repository is needed for regional package downloads.
+# Keep the channel's build mirrors intact; target mirrors are restored later.
+printf '\n' >> "$online_config"
+cat "$profile/pacman/pacman.conf.append" >> "$online_config"
+
+# The keyring package must be signed by a key already trusted by Arch. Do not
+# bootstrap trust from an unchecked keyserver response or disable signatures.
+# https://github.com/archlinuxcn/repo#usage
+pacman --config "$online_config" --noconfirm -Sy --needed archlinuxcn-keyring
+pacman-key --populate archlinuxcn