diff --git a/data/.gitignore b/data/.gitignore
index 1e4d7f1..7509b97 100644
--- a/data/.gitignore
+++ b/data/.gitignore
@@ -2,3 +2,4 @@
 /addresses-40-cnrs-rnsr-big-classes-test.txt
 /addresses-40-cnrs-rnsr-big-classes-train.txt
 /area-address.tsv
+/areas.txt
diff --git a/dvc.lock b/dvc.lock
index a247e23..43aab92 100644
--- a/dvc.lock
+++ b/dvc.lock
@@ -1,12 +1,11 @@
 schema: '2.0'
 stages:
   prepare:
-    cmd: node bin/address-to-area.mjs data/addresses-40-cnrs-rnsr-big-classes-train.txt
-      > data/area-address.tsv
+    cmd: node bin/address-to-area.mjs > data/area-address.tsv
     deps:
     - path: bin/address-to-area.mjs
-      md5: 92569f4ef93c42d6659b43c7a93abf1d
-      size: 1093
+      md5: 586c0f15529591e46a6b22e2a05770d5
+      size: 942
     - path: data/addresses-40-cnrs-rnsr-big-classes-train.txt
       md5: 612c9731294d230f5fd4ed8c10d67468
       size: 3694626
@@ -16,7 +15,20 @@
     - path: libs/geo.mjs
       md5: af499b4463e041aeb5f4ca58af486565
       size: 2443
+    params:
+      params.yaml:
+        prepare.input: data/addresses-40-cnrs-rnsr-big-classes-train.txt
     outs:
     - path: data/area-address.tsv
       md5: 179a8eb09f2ddf72dd9aa2add136fb87
       size: 4010846
+  extract-areas:
+    cmd: cat data/area-address.tsv| cut -f1 | sort -u > data/areas.txt
+    deps:
+    - path: data/area-address.tsv
+      md5: 179a8eb09f2ddf72dd9aa2add136fb87
+      size: 4010846
+    outs:
+    - path: data/areas.txt
+      md5: 6102ce8099fd61bccb6eb606b66ef260
+      size: 964
diff --git a/dvc.yaml b/dvc.yaml
index 3264443..8ede10d 100644
--- a/dvc.yaml
+++ b/dvc.yaml
@@ -11,3 +11,10 @@
     - prepare.input
     outs:
     - data/area-address.tsv
+  extract-areas:
+    desc: Extract geographic areas
+    cmd: cat data/area-address.tsv| cut -f1 | sort -u > data/areas.txt
+    deps:
+    - data/area-address.tsv
+    outs:
+    - data/areas.txt