diff --git a/frontend/components/layout/nav-items.test.ts b/frontend/components/layout/nav-items.test.ts
index 6e5da1f..6e46274 100644
--- a/frontend/components/layout/nav-items.test.ts
+++ b/frontend/components/layout/nav-items.test.ts
@@ -122,12 +122,12 @@ test("artifact-narrowed capabilities hide pages the release does not serve", ()
   expect(groups[0].items.map((item) => item.href)).toEqual(["/microcosm"]);
 });
 
-test("shows Cross-dataset navigation for every selectable country", () => {
+test("shows Cross-dataset navigation only for countries with that capability", () => {
   for (const country of selectableCountries()) {
     expect(
       navGroupsForCountry(country)
         .flatMap((group) => group.items)
         .some((item) => item.href === "/microcosm/datasets"),
-    ).toBe(true);
+    ).toBe(hasCapability(country, "cross_dataset"));
   }
 });
diff --git a/frontend/lib/microcosm/countries.test.ts b/frontend/lib/microcosm/countries.test.ts
index b1a21e7..59c0ef7 100644
--- a/frontend/lib/microcosm/countries.test.ts
+++ b/frontend/lib/microcosm/countries.test.ts
@@ -66,10 +66,20 @@ test("keeps the live registrations on their published repositories and labels",
     geography: "Belgium",
     visibility: "private",
   });
+  expect(countryRegistration("nz")).toMatchObject({
+    repo: "policyengine/populace-nz",
+    repo_env: "POPULACE_NZ_HF_REPO",
+    revision_env: "POPULACE_NZ_HF_REVISION",
+    label: "New Zealand",
+    dataset_label: "Microcosm NZ",
+    geography: "New Zealand",
+    geography_id: null,
+    visibility: "public",
+  });
 });
 
 test("selectable countries follow registry order and exclude fixtures", () => {
-  expect(selectableCountries()).toEqual(["us", "uk", "be"]);
+  expect(selectableCountries()).toEqual(["us", "uk", "be", "nz"]);
   expect(countryRegistration("zz").fixture).toBe(true);
   expect(selectableCountries()).not.toContain("zz");
 });
@@ -82,6 +92,7 @@ test("fixture registrations are valid countries without being selectable", () =>
 test("country parsing is exact and defaults to the registry default", () => {
   expect(DEFAULT_COUNTRY).toBe("us");
   expect(parseCountry("be")).toBe("be");
+  expect(parseCountry("nz")).toBe("nz");
   expect(parseCountry("uk")).toBe("uk");
   expect(parseCountry("us")).toBe("us");
   expect(parseCountry("BE")).toBe(DEFAULT_COUNTRY);
@@ -100,6 +111,8 @@ test("capability gates read the registration", () => {
   expect(hasCapability("uk", "staging")).toBe(false);
   expect(hasCapability("be", "pipeline")).toBe(false);
   expect(hasCapability("be", "cross_dataset")).toBe(true);
+  expect(hasCapability("nz", "cross_dataset")).toBe(false);
+  expect(hasCapability("nz", "model_coverage")).toBe(false);
   expect(countryCapabilities("be")).toEqual([
     "calibration",
     "targets",
@@ -107,6 +120,7 @@ test("capability gates read the registration", () => {
     "cross_dataset",
   ]);
   expect(countryCapabilities("zz")).toEqual(["calibration", "targets", "compare"]);
+  expect(countryCapabilities("nz")).toEqual(["calibration", "targets", "compare"]);
   expect(isCountryCapability("staging")).toBe(true);
   expect(isCountryCapability("dashboard_admin")).toBe(false);
   expect(isCountryCapability(7)).toBe(false);
diff --git a/frontend/lib/microcosm/countries.ts b/frontend/lib/microcosm/countries.ts
index 2b1de1e..5c61421 100644
--- a/frontend/lib/microcosm/countries.ts
+++ b/frontend/lib/microcosm/countries.ts
@@ -94,6 +94,18 @@ export const COUNTRY_REGISTRY = {
     visibility: "private",
     capabilities: CALIBRATION_CAPABILITIES,
   },
+  nz: {
+    repo: "policyengine/populace-nz",
+    revision: "main",
+    repo_env: "POPULACE_NZ_HF_REPO",
+    revision_env: "POPULACE_NZ_HF_REVISION",
+    label: "New Zealand",
+    dataset_label: "Microcosm NZ",
+    geography: "New Zealand",
+    geography_id: null,
+    visibility: "public",
+    capabilities: ["calibration", "targets", "compare"],
+  },
   // Synthetic repository used only by the third-country conformance fixture.
   zz: {
     repo: "policyengine/microcosm-zz-fixture",
diff --git a/frontend/lib/microcosm/latest-artifact.test.ts b/frontend/lib/microcosm/latest-artifact.test.ts
index 73acb2b..0c11772 100644
--- a/frontend/lib/microcosm/latest-artifact.test.ts
+++ b/frontend/lib/microcosm/latest-artifact.test.ts
@@ -14,6 +14,8 @@ import {
   MICROCOSM_HF_REVISION_ENV,
   MICROCOSM_BE_HF_REPO_ENV,
   MICROCOSM_BE_HF_REVISION_ENV,
+  MICROCOSM_NZ_HF_REPO_ENV,
+  MICROCOSM_NZ_HF_REVISION_ENV,
   MICROCOSM_UK_HF_REPO_ENV,
   MICROCOSM_UK_HF_REVISION_ENV,
   hfResolveUrl,
@@ -42,6 +44,8 @@ test("keeps Microcosm deployment configuration on its published Populace env con
     MICROCOSM_UK_HF_REVISION_ENV,
     MICROCOSM_BE_HF_REPO_ENV,
     MICROCOSM_BE_HF_REVISION_ENV,
+    MICROCOSM_NZ_HF_REPO_ENV,
+    MICROCOSM_NZ_HF_REVISION_ENV,
   ]).toEqual([
     "POPULACE_HF_REPO",
     "POPULACE_HF_REVISION",
@@ -49,11 +53,14 @@ test("keeps Microcosm deployment configuration on its published Populace env con
     "POPULACE_UK_HF_REVISION",
     "POPULACE_BE_HF_REPO",
     "POPULACE_BE_HF_REVISION",
+    "POPULACE_NZ_HF_REPO",
+    "POPULACE_NZ_HF_REVISION",
   ]);
 });
 
 test("coerces supported country parameters and defaults unknown values to US", () => {
   expect(parseCountry("be")).toBe("be");
+  expect(parseCountry("nz")).toBe("nz");
   expect(parseCountry("uk")).toBe("uk");
   expect(parseCountry("us")).toBe("us");
   expect(parseCountry("BE")).toBe("us");
@@ -74,6 +81,14 @@ test("uses the private Belgium repository and country revision", () => {
   );
 });
 
+test("uses the public New Zealand repository and country revision", () => {
+  expect(microcosmRepo("nz")).toBe("policyengine/populace-nz");
+  expect(microcosmRevision("nz")).toBe("main");
+  expect(hfResolveUrl("latest.json", "nz")).toBe(
+    "https://huggingface.co/datasets/policyengine/populace-nz/resolve/main/latest.json",
+  );
+});
+
 test("loads trimmed Belgium diagnostics without optional US artifact fields", () => {
   expect("loss_trajectory" in beDiagnosticsFixture).toBe(false);
   expect("past_cap_census" in beDiagnosticsFixture).toBe(false);
diff --git a/frontend/lib/microcosm/latest-artifact.ts b/frontend/lib/microcosm/latest-artifact.ts
index 6032263..535697c 100644
--- a/frontend/lib/microcosm/latest-artifact.ts
+++ b/frontend/lib/microcosm/latest-artifact.ts
@@ -58,6 +58,8 @@ export const MICROCOSM_UK_HF_REPO_ENV = COUNTRY_REGISTRY.uk.repo_env;
 export const MICROCOSM_UK_HF_REVISION_ENV = COUNTRY_REGISTRY.uk.revision_env;
 export const MICROCOSM_BE_HF_REPO_ENV = COUNTRY_REGISTRY.be.repo_env;
 export const MICROCOSM_BE_HF_REVISION_ENV = COUNTRY_REGISTRY.be.revision_env;
+export const MICROCOSM_NZ_HF_REPO_ENV = COUNTRY_REGISTRY.nz.repo_env;
+export const MICROCOSM_NZ_HF_REVISION_ENV = COUNTRY_REGISTRY.nz.revision_env;
 
 interface MicrocosmCountryRepository {
   repo: string;
diff --git a/frontend/lib/microcosm/source-attribution.test.ts b/frontend/lib/microcosm/source-attribution.test.ts
index 1f6fc03..c86b70b 100644
--- a/frontend/lib/microcosm/source-attribution.test.ts
+++ b/frontend/lib/microcosm/source-attribution.test.ts
@@ -23,6 +23,13 @@ test("links Microcosm to the public US Hugging Face dataset", () => {
   });
 });
 
+test("links Microcosm to the public New Zealand Hugging Face dataset", () => {
+  expect(microcosmSourceAttribution("nz", "policyengine/populace-nz")).toEqual({
+    label: "Microcosm",
+    href: "https://huggingface.co/datasets/policyengine/populace-nz",
+  });
+});
+
 test("does not expose the private UK Hugging Face dataset", () => {
   expect(microcosmSourceAttribution("uk", "policyengine/populace-uk-private")).toEqual({
     label: "Microcosm",