diff --git a/astro.config.mjs b/astro.config.mjs
index fa979ac..b53bbef 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -2,6 +2,7 @@ import { defineConfig } from "astro/config";
 
 import sitemap from "@astrojs/sitemap";
 import tailwind from "@astrojs/tailwind";
+import { getAlternateUrls } from "./src/utils/page-translations.ts";
 
 // https://astro.build/config
 export default defineConfig({
@@ -10,13 +11,21 @@ export default defineConfig({
 	integrations: [
 		tailwind(),
 		sitemap({
-			i18n: {
-				defaultLocale: "fr",
-				locales: {
-					fr: "fr",
-					en: "en",
-					ar: "ar",
-				},
+			serialize(item) {
+				const url = new URL(item.url);
+				const pathname = decodeURIComponent(url.pathname).replace(/\/$/, "") || "/";
+				const alternates = getAlternateUrls(pathname);
+				if (alternates) {
+					const fullUrl = (path) =>
+						path === "/" ? `${url.origin}/` : `${url.origin}${path}/`;
+					item.links = [
+						{ lang: "fr", url: fullUrl(alternates.fr) },
+						{ lang: "en", url: fullUrl(alternates.en) },
+						{ lang: "ar", url: fullUrl(alternates.ar) },
+						{ lang: "x-default", url: fullUrl(alternates.fr) },
+					];
+				}
+				return item;
 			},
 		}),
 	],
diff --git a/src/utils/page-translations.ts b/src/utils/page-translations.ts
index df469dd..0763a97 100644
--- a/src/utils/page-translations.ts
+++ b/src/utils/page-translations.ts
@@ -1,4 +1,5 @@
 import type { Locale } from "./i18n";
+import { getPhotoAlbumsPath, getPhotoBlogPath } from "./i18n";
 
 /**
  * Groupes de pages traduites.
@@ -14,6 +15,7 @@ const translationGroups: Record<Locale, string>[] = [
 	{ fr: "/code/competences", en: "/en/code/skills", ar: "/ar/برمجة/مهارات" },
 	{ fr: "/theatre", en: "/en/acting", ar: "/ar/مسرح" },
 	{ fr: "/photo", en: "/en/photo", ar: "/ar/تصوير" },
+	{ fr: "/photo/blog", en: "/en/photo/blog", ar: "/ar/تصوير/مدونة" },
 ];
 
 /** Index inversé : pathname → groupe de traduction */
@@ -24,13 +26,59 @@ for (const group of translationGroups) {
 	}
 }
 
+/** Pattern dynamique pour les routes paramétrées */
+interface DynamicPattern {
+	regex: RegExp;
+	buildUrls: (match: RegExpMatchArray) => Record<Locale, string>;
+}
+
+const dynamicPatterns: DynamicPattern[] = [
+	{
+		// Photo albums: /photo/albums/{cat}, /en/photo/albums/{cat}, /ar/تصوير/ألبومات/{cat}
+		regex: /^(?:\/photo\/albums|\/en\/photo\/albums|\/ar\/تصوير\/ألبومات)\/([^/]+)$/,
+		buildUrls: (match) => {
+			const category = match[1];
+			return {
+				fr: `${getPhotoAlbumsPath("fr")}/${category}`,
+				en: `${getPhotoAlbumsPath("en")}/${category}`,
+				ar: `${getPhotoAlbumsPath("ar")}/${category}`,
+			};
+		},
+	},
+	{
+		// Photo blog posts: /photo/blog/{year}/{slug}, /en/photo/blog/{year}/{slug}, /ar/تصوير/مدونة/{year}/{slug}
+		regex: /^(?:\/photo\/blog|\/en\/photo\/blog|\/ar\/تصوير\/مدونة)\/(\d{4})\/([^/]+)$/,
+		buildUrls: (match) => {
+			const [, year, slug] = match;
+			return {
+				fr: `${getPhotoBlogPath("fr")}/${year}/${slug}`,
+				en: `${getPhotoBlogPath("en")}/${year}/${slug}`,
+				ar: `${getPhotoBlogPath("ar")}/${year}/${slug}`,
+			};
+		},
+	},
+];
+
+function matchDynamicPattern(
+	pathname: string,
+): Record<Locale, string> | undefined {
+	for (const pattern of dynamicPatterns) {
+		const match = pathname.match(pattern.regex);
+		if (match) {
+			return pattern.buildUrls(match);
+		}
+	}
+	return undefined;
+}
+
 /**
  * Retourne les URLs alternatives pour un pathname donné.
  * Les trailing slashes sont normalisés.
+ * Essaie d'abord le lookup statique, puis le matching dynamique.
  */
 export function getAlternateUrls(
 	pathname: string,
 ): Record<Locale, string> | undefined {
 	const normalized = pathname.replace(/\/$/, "") || "/";
-	return pathIndex.get(normalized);
+	return pathIndex.get(normalized) ?? matchDynamicPattern(normalized);
 }