diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 1fdfdb51a8..2f396d20a0 100755
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -8149,6 +8149,17 @@
       <key>Value</key>
       <integer>256</integer>
     </map>
+    <key>RegionCheckTextureHeights</key>
+    <map>
+      <key>Comment</key>
+      <string>Don't allow user to set low heights greater than high</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>1</integer>
+    </map>
     <key>RememberPassword</key>
     <map>
       <key>Comment</key>
diff --git a/indra/newview/llfloaterregioninfo.cpp b/indra/newview/llfloaterregioninfo.cpp
index 16566bea73..df5b226d98 100755
--- a/indra/newview/llfloaterregioninfo.cpp
+++ b/indra/newview/llfloaterregioninfo.cpp
@@ -1184,6 +1184,22 @@ BOOL LLPanelRegionTerrainInfo::validateTextureSizes()
 	return TRUE;
 }
 
+BOOL LLPanelRegionTerrainInfo::validateTextureHeights()
+{
+	for (S32 i = 0; i < CORNER_COUNT; ++i)
+	{
+		std::string low = llformat("height_start_spin_%d", i);
+		std::string high = llformat("height_range_spin_%d", i);
+
+		if (getChild<LLUICtrl>(low)->getValue().asReal() > getChild<LLUICtrl>(high)->getValue().asReal())
+		{
+			return FALSE;
+		}
+	}
+
+	return TRUE;
+}
+
 /////////////////////////////////////////////////////////////////////////////
 // LLPanelRegionTerrainInfo
 /////////////////////////////////////////////////////////////////////////////
@@ -1216,6 +1232,9 @@ BOOL LLPanelRegionTerrainInfo::postBuild()
 	childSetAction("upload_raw_btn", onClickUploadRaw, this);
 	childSetAction("bake_terrain_btn", onClickBakeTerrain, this);
 
+	mAskedTextureHeights = false;
+	mConfirmedTextureHeights = false;
+
 	return LLPanelRegionInfo::postBuild();
 }
 
@@ -1298,6 +1317,21 @@ BOOL LLPanelRegionTerrainInfo::sendUpdate()
 		return FALSE;
 	}
 
+	// Check if terrain Elevation Ranges are correct
+	if (gSavedSettings.getBOOL("RegionCheckTextureHeights") && !validateTextureHeights())
+	{
+		if (!mAskedTextureHeights)
+		{
+			LLNotificationsUtil::add("ConfirmTextureHeights", LLSD(), LLSD(), boost::bind(&LLPanelRegionTerrainInfo::callbackTextureHeights, this, _1, _2));
+			mAskedTextureHeights = true;
+			return FALSE;
+		}
+		else if (!mConfirmedTextureHeights)
+		{
+			return FALSE;
+		}
+	}
+
 	LLTextureCtrl* texture_ctrl;
 	std::string id_str;
 	LLMessageSystem* msg = gMessageSystem;
@@ -1338,6 +1372,29 @@ BOOL LLPanelRegionTerrainInfo::sendUpdate()
 	return TRUE;
 }
 
+bool LLPanelRegionTerrainInfo::callbackTextureHeights(const LLSD& notification, const LLSD& response)
+{
+	S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
+	if (option == 0) // ok
+	{
+		mConfirmedTextureHeights = true;
+	}
+	else if (option == 1) // cancel
+	{
+		mConfirmedTextureHeights = false;
+	}
+	else if (option == 2) // don't ask
+	{
+		gSavedSettings.setBOOL("RegionCheckTextureHeights", FALSE);
+		mConfirmedTextureHeights = true;
+	}
+
+	onBtnSet();
+
+	mAskedTextureHeights = false;
+	return false;
+}
+
 // static
 void LLPanelRegionTerrainInfo::onClickDownloadRaw(void* data)
 {
diff --git a/indra/newview/llfloaterregioninfo.h b/indra/newview/llfloaterregioninfo.h
index e7b49d8553..4cd50c0882 100755
--- a/indra/newview/llfloaterregioninfo.h
+++ b/indra/newview/llfloaterregioninfo.h
@@ -237,6 +237,7 @@ public:
 	void setEnvControls(bool available);									// Whether environment settings are available for this region
 
 	BOOL validateTextureSizes();
+	BOOL validateTextureHeights();
 
 	//static void onChangeAnything(LLUICtrl* ctrl, void* userData);			// callback for any change, to enable commit button
 	
@@ -246,6 +247,11 @@ public:
 	static void onClickUploadRaw(void*);
 	static void onClickBakeTerrain(void*);
 	bool callbackBakeTerrain(const LLSD& notification, const LLSD& response);
+	bool callbackTextureHeights(const LLSD& notification, const LLSD& response);
+
+private:
+	bool mConfirmedTextureHeights;
+	bool mAskedTextureHeights;
 };
 
 /////////////////////////////////////////////////////////////////////////////
diff --git a/indra/newview/skins/default/xui/en/notifications.xml b/indra/newview/skins/default/xui/en/notifications.xml
index d567897ed8..74e1eb527c 100755
--- a/indra/newview/skins/default/xui/en/notifications.xml
+++ b/indra/newview/skins/default/xui/en/notifications.xml
@@ -3578,6 +3578,19 @@ Do you really want to bake the current terrain, make it the center for terrain r
      yestext="OK"/>
   </notification>
 
+  <notification
+   icon="alertmodal.tga"
+   name="ConfirmTextureHeights"
+   type="alertmodal">
+You're about to use low values greater than high ones for Elevation Ranges. Proceed?
+   <tag>confirm</tag>
+   <usetemplate
+    name="yesnocancelbuttons"
+    yestext="Ok"
+    notext="Cancel"
+    canceltext="Don't ask"/>
+  </notification>
+
   <notification
    icon="alertmodal.tga"
    name="MaxAllowedAgentOnRegion"