diff --git a/data.yml b/data.yml
index 285e76f..437d30a 100644
--- a/data.yml
+++ b/data.yml
@@ -74,7 +74,9 @@ Layer:
               UNION ALL
               SELECT * FROM boundary_z1 WHERE z(!scale_denominator!) BETWEEN 1 AND 2
               UNION ALL
-              SELECT * FROM boundary_z3 WHERE z(!scale_denominator!) BETWEEN 3 AND 4
+              SELECT * FROM boundary_z3 WHERE z(!scale_denominator!) = 3
+              UNION ALL
+              SELECT * FROM boundary_z4 WHERE z(!scale_denominator!) = 4
               UNION ALL
               SELECT * FROM boundary_z5 WHERE z(!scale_denominator!) BETWEEN 5 AND 6
               UNION ALL
diff --git a/schema/layers/boundary.sql b/schema/layers/boundary.sql
index 4201c18..afaf5ab 100644
--- a/schema/layers/boundary.sql
+++ b/schema/layers/boundary.sql
@@ -38,6 +38,17 @@ CREATE OR REPLACE VIEW boundary_z3 AS (
     FROM ne_50m_admin_1_states_provinces_lines
 );
 
+CREATE OR REPLACE VIEW boundary_z4 AS (
+    SELECT geom, 0 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_10m_admin_0_boundary_lines_land
+    UNION ALL
+    SELECT geom, 1 AS admin_level, scalerank,
+           boundary_class(featurecla) AS class
+    FROM ne_10m_admin_1_states_provinces_lines_shp
+    WHERE scalerank <= 3 AND featurecla = 'Adm-1 boundary'
+);
+
 CREATE OR REPLACE VIEW boundary_z5 AS (
     SELECT geom, 0 AS admin_level, scalerank,
            boundary_class(featurecla) AS class