diff --git a/dbmanager.js b/dbmanager.js
index 9b5bdfe..48c04a0 100644
--- a/dbmanager.js
+++ b/dbmanager.js
@@ -101,7 +101,7 @@ class DBManager {
     }
 
     get_regionMap() {
-        return this.db_.collection($COLLECTION__REGION_MAP).find().toArray().then((docs,err)=>{
+        return this.db_.collection($COLLECTION__REGION_MAP).find({}, { projection: { _id: 0 } }).toArray().then((docs,err)=>{
             if(err){
                 console.log(`dbmanager::get_regionMap error`,err);
                 return ;
diff --git a/js/covizu.js b/js/covizu.js
index 4461295..9817013 100644
--- a/js/covizu.js
+++ b/js/covizu.js
@@ -284,7 +284,6 @@ req = $.when(
   }),
   $.getJSON("/api/regionmap", function(data) {
     region_map = data;
-    delete region_map._id;
   })
 );