diff --git a/ckanext/spatial/public/js/dataset_map.js b/ckanext/spatial/public/js/dataset_map.js
index 90c3988..7092a16 100644
--- a/ckanext/spatial/public/js/dataset_map.js
+++ b/ckanext/spatial/public/js/dataset_map.js
@@ -25,6 +25,19 @@ this.ckan.module('dataset-map', function (jQuery, _) {
 
       this.extent = this.el.data('extent');
 
+      // fix bbox when w-long is positive while e-long is negative.
+      if (this.extent.type == 'Polygon'
+        && this.extent.coordinates[0].length == 5) {
+        _coordinates = this.extent.coordinates
+        s = _coordinates[0][0][1];
+        w = _coordinates[0][0][0];
+        n = _coordinates[0][2][1];
+        e = _coordinates[0][1][0];
+        while (w > e) w -=360
+
+        this.extent.coordinates = [[[w,s],[e,s],[e,n],[w,n],[w,s]]]
+      };
+
       // hack to make leaflet use a particular location to look for images
       L.Icon.Default.imagePath = this.options.site_url + 'js/vendor/leaflet/images';