diff --git a/install/config/all.sh b/install/config/all.sh
index a221a398..3b5655a9 100644
--- a/install/config/all.sh
+++ b/install/config/all.sh
@@ -1,3 +1,4 @@
+run_logged "$OMARCHY_INSTALL/config/region.sh"
 run_logged "$OMARCHY_INSTALL/config/theme-system.sh"
 run_logged "$OMARCHY_INSTALL/config/browser-policy.sh"
 run_logged "$OMARCHY_INSTALL/config/increase-lockout-limit.sh"
diff --git a/install/config/region.sh b/install/config/region.sh
new file mode 100644
index 00000000..deec32e9
--- /dev/null
+++ b/install/config/region.sh
@@ -0,0 +1,13 @@
+case ${OMARCHY_REGION:-global} in
+global)
+  rm -f /etc/omarchy/region
+  ;;
+china)
+  mkdir -p /etc/omarchy
+  echo china >/etc/omarchy/region
+  ;;
+*)
+  echo "Unknown OMARCHY_REGION: $OMARCHY_REGION" >&2
+  exit 1
+  ;;
+esac
diff --git a/install/provisioning/setup-form.sh b/install/provisioning/setup-form.sh
index f4265d1d..9d8bd0d2 100644
--- a/install/provisioning/setup-form.sh
+++ b/install/provisioning/setup-form.sh
@@ -18,8 +18,9 @@
 # so it never reaches the shell as SIGINT. Act on the status, never on a trap.
 #
 # Callers supply `notice <message> <seconds>` for validation feedback, and set
-# the variables these prompts write: keyboard, keyboard_label, username,
-# password, password_confirmation, full_name, email_address, hostname, timezone.
+# the variables these prompts write: region, keyboard, keyboard_label,
+# username, password, password_confirmation, full_name, email_address,
+# hostname, timezone.
 
 OMARCHY_FORM_BACK=1
 OMARCHY_FORM_SIGNAL=130
@@ -91,6 +92,15 @@ omarchy_username_taken() { return 1; }
 # by `status=$?`: one caller runs under `set -e`, where a cancelled prompt is a
 # failing assignment that would kill the script before the status is read.
 
+# China lists the .cn package mirrors first and sets up Chinese input.
+omarchy_prompt_region() {
+  local choice status
+  choice=$(gum choose --selected "Global" --header "Select region" Global China) && status=0 || status=$?
+  ((status == 0)) || return $status
+
+  region=${choice,,}
+}
+
 omarchy_prompt_keyboard() {
   local choice status
   choice=$(printf '%s\n' "$OMARCHY_KEYBOARD_LAYOUTS" | cut -d'|' -f1 |
diff --git a/plans/omarchycn.md b/plans/omarchycn.md
index b455c20e..cbdfe7ed 100644
--- a/plans/omarchycn.md
+++ b/plans/omarchycn.md
@@ -13,8 +13,8 @@ Progress source of truth for the `omarchycn` branches of `omarchy`, `omarchy-iso
 
 ## Tasks
 
-- [ ] T0 Branches and this list
-- [ ] T1 China package sources (PRD 1): region state, `omarchy-region` reader, `default/region/china/pacman.sed`, applied by `omarchy-refresh-pacman` and `install/post-install/pacman.sh`; tests
+- [x] T0 Branches and this list
+- [x] T1 China package sources (PRD 1): region state, `omarchy-region` reader, `default/region/china/pacman.sed`, applied by `omarchy-refresh-pacman` and `install/post-install/pacman.sh`; tests
 - [ ] T2 Region choice in the installer (PRD 2): `omarchy_prompt_region` in `setup-form.sh`, ISO configurator screen, orchestrator passes `OMARCHY_REGION`, `install/config/region.sh` records it
 - [ ] T3 Input method (PRD 3): rime-ice-installer patch and PKGBUILD in omarchy-pkgs, IME packages in `omarchy-other.packages`, install-time package add, user step runs the installer from bundled assets, ISO build bundles assets and the package
 - [ ] T4 CJK fontconfig fix (PRD 4): rebuild PR 9693 on the current base
diff --git a/test/shell.d/region-test.sh b/test/shell.d/region-test.sh
index e471e33d..49399014 100755
--- a/test/shell.d/region-test.sh
+++ b/test/shell.d/region-test.sh
@@ -54,3 +54,23 @@ if output=$("$region_bin" 2>&1); then
 fi
 [[ $output == "Unknown region in $region_file: mars" ]] || fail "an unknown region names the file and value" "$output"
 pass "an unknown region fails and names the file and value"
+
+region_setup="$test_tmp/region.sh"
+sed "s|/etc/omarchy|$test_tmp/etc-omarchy|g" "$ROOT/install/config/region.sh" >"$region_setup"
+
+OMARCHY_REGION=china bash -e "$region_setup"
+[[ $(<"$test_tmp/etc-omarchy/region") == "china" ]] || fail "install records the China region"
+pass "install records the China region"
+
+OMARCHY_REGION=global bash -e "$region_setup"
+[[ ! -e $test_tmp/etc-omarchy/region ]] || fail "install records Global by leaving no region file"
+OMARCHY_REGION=china bash -e "$region_setup"
+env -u OMARCHY_REGION bash -e "$region_setup"
+[[ ! -e $test_tmp/etc-omarchy/region ]] || fail "an installer that passes no region installs Global"
+pass "Global and an unset region leave no region file"
+
+if output=$(OMARCHY_REGION=mars bash -e "$region_setup" 2>&1); then
+  fail "install rejects an unknown region" "$output"
+fi
+[[ $output == "Unknown OMARCHY_REGION: mars" ]] || fail "install names the unknown region" "$output"
+pass "install rejects an unknown region"
diff --git a/test/shell.d/setup-form-test.sh b/test/shell.d/setup-form-test.sh
index 2b9878eb..3e5ff777 100755
--- a/test/shell.d/setup-form-test.sh
+++ b/test/shell.d/setup-form-test.sh
@@ -61,6 +61,7 @@ trap 'if [[ ${FUNCNAME[0]:-} == "$PROMPT_FN" ]]; then printf "returned\n" >>"$MA
 
 "$PROMPT_FN"
 
+printf 'region=%s\n' "${region:-}"
 printf 'keyboard=%s\n' "${keyboard:-}"
 printf 'keyboard_label=%s\n' "${keyboard_label:-}"
 printf 'username=%s\n' "${username:-}"
@@ -123,6 +124,25 @@ source "$ROOT/install/provisioning/setup-form.sh"
   fail "English (US) leads the keyboard layouts so gum choose opens on the default"
 pass "the form publishes the 0/1/130 status contract and leads with English (US)"
 
+# Region
+
+run_prompt omarchy_prompt_region "0:China"
+assert_status 0 "region prompt succeeds"
+[[ $(field region) == "china" ]] || fail "region prompt stores China as china"
+grep -qxF -- 'choose --selected Global --header Select region Global China' "$GUM_ARGS" || fail "region prompt offers Global then China and preselects Global"
+run_prompt omarchy_prompt_region "0:Global"
+[[ $(field region) == "global" ]] || fail "region prompt stores Global as global"
+pass "region prompt maps Global and China to the stored region"
+
+run_prompt omarchy_prompt_region "1:"
+assert_status "$OMARCHY_FORM_BACK" "region prompt reports Esc as back"
+assert_returned "region prompt survives Esc under set -e"
+
+run_prompt omarchy_prompt_region "130:"
+assert_status "$OMARCHY_FORM_SIGNAL" "region prompt reports Ctrl+C as the caller's signal"
+assert_returned "region prompt survives Ctrl+C under set -e"
+pass "region prompt propagates Esc and Ctrl+C without dying under set -e"
+
 # Keyboard
 
 run_prompt omarchy_prompt_keyboard "0:German"