diff --git a/hasura/functions/tournaments/sync_tournament_match_options.sql b/hasura/functions/tournaments/sync_tournament_match_options.sql
new file mode 100644
index 00000000..d4553293
--- /dev/null
+++ b/hasura/functions/tournaments/sync_tournament_match_options.sql
@@ -0,0 +1,56 @@
+CREATE OR REPLACE FUNCTION public.sync_tournament_match_options(
+    _old public.match_options,
+    _new public.match_options
+) RETURNS void
+    LANGUAGE plpgsql
+    AS $$
+DECLARE
+    _assignments text;
+    _descendant_ids uuid[];
+BEGIN
+    -- A descendant follows a column only while it still holds the template's
+    -- old value; anything else is a deliberate stage override or a hand-edited
+    -- match. best_of is never inherited: schedule_tournament_match resolves it
+    -- from the stage's round config.
+    SELECT string_agg(
+        format(
+            '%1$I = CASE WHEN %1$I IS NOT DISTINCT FROM ($1).%1$I THEN ($2).%1$I ELSE %1$I END',
+            changed.key
+        ),
+        ', '
+    )
+    INTO _assignments
+    FROM jsonb_each(to_jsonb(_new)) changed
+    WHERE changed.value IS DISTINCT FROM to_jsonb(_old) -> changed.key
+      AND changed.key NOT IN ('id', 'invite_code', 'best_of');
+
+    IF _assignments IS NULL THEN
+        RETURN;
+    END IF;
+
+    SELECT array_agg(descendant.match_options_id)
+    INTO _descendant_ids
+    FROM (
+        SELECT ts.match_options_id
+        FROM tournaments t
+        INNER JOIN tournament_stages ts ON ts.tournament_id = t.id
+        WHERE t.match_options_id = _new.id
+          AND ts.match_options_id IS NOT NULL
+        UNION
+        SELECT m.match_options_id
+        FROM tournament_brackets tb
+        INNER JOIN tournament_stages ts ON ts.id = tb.tournament_stage_id
+        INNER JOIN tournaments t ON t.id = ts.tournament_id
+        INNER JOIN matches m ON m.id = tb.match_id
+        WHERE COALESCE(tb.match_options_id, ts.match_options_id, t.match_options_id) = _new.id
+          AND m.status IN ('PickingPlayers', 'Scheduled', 'WaitingForCheckIn')
+    ) descendant;
+
+    IF _descendant_ids IS NULL THEN
+        RETURN;
+    END IF;
+
+    EXECUTE format('UPDATE match_options SET %s WHERE id = ANY($3)', _assignments)
+    USING _old, _new, _descendant_ids;
+END;
+$$;
diff --git a/hasura/triggers/match_options.sql b/hasura/triggers/match_options.sql
index 0b038a7d..be6f0267 100644
--- a/hasura/triggers/match_options.sql
+++ b/hasura/triggers/match_options.sql
@@ -140,6 +140,21 @@ BEGIN
         PERFORM refresh_veto_pick_expiry(_match_id);
     END IF;
 
+    -- tbi_match pins matches.region from a single-region option set, and
+    -- nothing re-reads it before Veto, so a match drawn early keeps hosting on
+    -- the region it was created with unless the pin moves with its options.
+    IF (NEW.regions IS DISTINCT FROM OLD.regions AND _match_status IN ('PickingPlayers', 'Scheduled', 'WaitingForCheckIn')) THEN
+        IF cardinality(NEW.regions) = 1 THEN
+            UPDATE matches SET region = NEW.regions[1]
+            WHERE id = _match_id AND region IS DISTINCT FROM NEW.regions[1];
+        ELSIF NEW.region_veto THEN
+            UPDATE matches SET region = NULL
+            WHERE id = _match_id AND region IS NOT NULL;
+        END IF;
+    END IF;
+
+    PERFORM sync_tournament_match_options(OLD, NEW);
+
     RETURN NEW;
 END;
 $$;
diff --git a/test/tournament-region-change.spec.ts b/test/tournament-region-change.spec.ts
new file mode 100644
index 00000000..58cb1783
--- /dev/null
+++ b/test/tournament-region-change.spec.ts
@@ -0,0 +1,267 @@
+import { PostgresService } from "./../src/postgres/postgres.service";
+import { Fixtures } from "./utils/fixtures";
+import { TournamentFixtures } from "./utils/tournament-fixtures";
+import {
+  bootMigratedDb,
+  seedRegionWithServer,
+  SqlTestDb,
+} from "./utils/sql-test-db";
+
+// An organizer moves a tournament onto the LAN region and the first matches
+// still came out on the region it was created with: round 1 is drawn (and its
+// options cloned) at RegistrationClosed, and a stage that customized any
+// advanced setting carries its own full snapshot of the tournament's options.
+describe("changing a tournament's region before it starts (SQL-driven)", () => {
+  let db: SqlTestDb;
+  let postgres: PostgresService;
+  let fx: Fixtures;
+  let tfx: TournamentFixtures;
+
+  const SE4 = [{ type: "SingleElimination", order: 1, minTeams: 4, maxTeams: 4 }];
+
+  beforeAll(async () => {
+    db = await bootMigratedDb("TournamentRegionChangeTest");
+    postgres = db.postgres;
+    fx = new Fixtures(postgres, 76561199500000000n);
+    tfx = new TournamentFixtures(postgres, fx);
+    await seedRegionWithServer(postgres, "TestA", 27015);
+    await seedRegionWithServer(postgres, "TestB", 27017);
+    await postgres.query(
+      `INSERT INTO server_regions (value, description, is_lan)
+       VALUES ('TestLan', 'TestLan', true) ON CONFLICT (value) DO NOTHING`,
+    );
+    await postgres.query(
+      `INSERT INTO servers (host, label, rcon_password, port, region, type, is_dedicated, enabled)
+       VALUES ('127.0.0.1', 'TestLan', $1, 27016, 'TestLan', 'Ranked', true, true)`,
+      [Buffer.from("password")],
+    );
+  }, 600_000);
+
+  afterAll(async () => {
+    await db?.stop();
+  });
+
+  beforeEach(async () => {
+    await postgres.query("DELETE FROM matches");
+    await postgres.query("DELETE FROM tournaments");
+    await postgres.query("DELETE FROM match_options");
+    await postgres.query("DELETE FROM teams");
+    await postgres.query("DELETE FROM players");
+  });
+
+  const moveTournamentTo = (tournamentId: string, region: string) =>
+    postgres.query(
+      `UPDATE match_options SET regions = $2, region_veto = false
+       WHERE id = (SELECT match_options_id FROM tournaments WHERE id = $1)`,
+      [tournamentId, [region]],
+    );
+
+  // What TournamentStageForm.createMatchOptions writes: a full copy of the
+  // tournament's options carrying whichever advanced settings differ.
+  const giveStageOwnOptions = async (
+    tournamentId: string,
+    stageId: string,
+    overrides: { regions?: Array<string>; tv_delay?: number },
+  ) => {
+    const [options] = await postgres.query<Array<{ id: string }>>(
+      `INSERT INTO match_options (mr, best_of, type, map_pool_id, map_veto, region_veto, regions, tv_delay)
+       SELECT mr, best_of, type, map_pool_id, map_veto,
+              CASE WHEN $2::text[] IS NULL THEN region_veto ELSE false END,
+              COALESCE($2::text[], regions),
+              COALESCE($3::int, tv_delay)
+       FROM match_options
+       WHERE id = (SELECT match_options_id FROM tournaments WHERE id = $1)
+       RETURNING id`,
+      [tournamentId, overrides.regions ?? null, overrides.tv_delay ?? null],
+    );
+    await postgres.query(
+      `UPDATE tournament_stages SET match_options_id = $1 WHERE id = $2`,
+      [options.id, stageId],
+    );
+  };
+
+  const closeRegistration = async (tournament: {
+    id: string;
+    organizer: string;
+  }) => {
+    await tfx.setStatus(tournament.id, tournament.organizer, "RegistrationOpen");
+    for (let i = 0; i < 4; i++) {
+      await tfx.registerTeam(tournament.id, await fx.team(1));
+    }
+    await tfx.setStatus(
+      tournament.id,
+      tournament.organizer,
+      "RegistrationClosed",
+    );
+  };
+
+  const roundMatches = (stageId: string, round: number) =>
+    postgres.query<
+      Array<{
+        id: string;
+        match_options_id: string;
+        regions: Array<string>;
+        region: string | null;
+        status: string;
+        tv_delay: number;
+      }>
+    >(
+      `SELECT m.id, m.match_options_id, mo.regions, m.region, m.status, mo.tv_delay
+       FROM tournament_brackets tb
+       INNER JOIN matches m ON m.id = tb.match_id
+       INNER JOIN match_options mo ON mo.id = m.match_options_id
+       WHERE tb.tournament_stage_id = $1 AND tb.round = $2
+       ORDER BY tb.match_number`,
+      [stageId, round],
+    );
+
+  it("hosts round 1 on a region chosen before the draw", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await moveTournamentTo(tournament.id, "TestLan");
+
+    await closeRegistration(tournament);
+    await tfx.setStatus(tournament.id, tournament.organizer, "Live");
+
+    const matches = await roundMatches(tournament.stageIds[0], 1);
+
+    expect(matches.length).toBe(2);
+    for (const match of matches) {
+      expect(match.regions).toEqual(["TestLan"]);
+      expect(match.region).toBe("TestLan");
+    }
+  });
+
+  it("moves already-drawn round 1 matches when the region changes afterwards", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await closeRegistration(tournament);
+
+    const drawn = await roundMatches(tournament.stageIds[0], 1);
+    expect(drawn.map((match) => match.status)).toEqual([
+      "Scheduled",
+      "Scheduled",
+    ]);
+
+    await moveTournamentTo(tournament.id, "TestLan");
+    await tfx.setStatus(tournament.id, tournament.organizer, "Live");
+
+    const matches = await roundMatches(tournament.stageIds[0], 1);
+
+    expect(matches.length).toBe(2);
+    for (const match of matches) {
+      expect(match.regions).toEqual(["TestLan"]);
+      expect(match.region).toBe("TestLan");
+    }
+  });
+
+  it("moves matches still waiting for check-in once the tournament is live", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await closeRegistration(tournament);
+    await tfx.setStatus(tournament.id, tournament.organizer, "Live");
+
+    await moveTournamentTo(tournament.id, "TestLan");
+
+    const matches = await roundMatches(tournament.stageIds[0], 1);
+
+    expect(matches.map((match) => match.status)).toEqual([
+      "WaitingForCheckIn",
+      "WaitingForCheckIn",
+    ]);
+    for (const match of matches) {
+      expect(match.regions).toEqual(["TestLan"]);
+      expect(match.region).toBe("TestLan");
+    }
+  });
+
+  it("carries the new region through a stage that only customized tv_delay", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await giveStageOwnOptions(tournament.id, tournament.stageIds[0], {
+      tv_delay: 90,
+    });
+
+    await moveTournamentTo(tournament.id, "TestLan");
+    await closeRegistration(tournament);
+    await tfx.setStatus(tournament.id, tournament.organizer, "Live");
+
+    const matches = await roundMatches(tournament.stageIds[0], 1);
+
+    expect(matches.length).toBe(2);
+    for (const match of matches) {
+      expect(match.regions).toEqual(["TestLan"]);
+      expect(match.region).toBe("TestLan");
+      expect(match.tv_delay).toBe(90);
+    }
+  });
+
+  it("carries the new region through such a stage after the draw too", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await giveStageOwnOptions(tournament.id, tournament.stageIds[0], {
+      tv_delay: 90,
+    });
+    await closeRegistration(tournament);
+
+    await moveTournamentTo(tournament.id, "TestLan");
+
+    const matches = await roundMatches(tournament.stageIds[0], 1);
+
+    expect(matches.length).toBe(2);
+    for (const match of matches) {
+      expect(match.regions).toEqual(["TestLan"]);
+      expect(match.region).toBe("TestLan");
+      expect(match.tv_delay).toBe(90);
+    }
+  });
+
+  it("leaves a stage on the region it deliberately overrode", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await giveStageOwnOptions(tournament.id, tournament.stageIds[0], {
+      regions: ["TestLan"],
+    });
+    await closeRegistration(tournament);
+
+    await moveTournamentTo(tournament.id, "TestB");
+
+    const matches = await roundMatches(tournament.stageIds[0], 1);
+
+    expect(matches.length).toBe(2);
+    for (const match of matches) {
+      expect(match.regions).toEqual(["TestLan"]);
+      expect(match.region).toBe("TestLan");
+    }
+  });
+
+  it("leaves a hand-edited match where the organizer put it", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await closeRegistration(tournament);
+
+    const [edited] = await roundMatches(tournament.stageIds[0], 1);
+    await postgres.query(
+      `UPDATE match_options SET regions = '{TestLan}', region_veto = false WHERE id = $1`,
+      [edited.match_options_id],
+    );
+
+    await moveTournamentTo(tournament.id, "TestB");
+
+    const matches = await roundMatches(tournament.stageIds[0], 1);
+
+    expect(matches.map((match) => match.region)).toEqual(["TestLan", "TestB"]);
+  });
+
+  it("does not reach back into finished matches", async () => {
+    const tournament = await tfx.createTournament(SE4);
+    await closeRegistration(tournament);
+    await tfx.setStatus(tournament.id, tournament.organizer, "Live");
+    await tfx.playRound(tournament.stageIds[0], 1);
+
+    await moveTournamentTo(tournament.id, "TestLan");
+
+    const played = await roundMatches(tournament.stageIds[0], 1);
+    const final = await roundMatches(tournament.stageIds[0], 2);
+
+    for (const match of played) {
+      expect(match.regions).toEqual(["TestA"]);
+    }
+    expect(final.length).toBe(1);
+    expect(final[0].regions).toEqual(["TestLan"]);
+    expect(final[0].region).toBe("TestLan");
+  });
+});