You can limit the view able area and zoom level of the google map using limit panning settings. Google map plugin provides easiest way to limit panning/dragging so the map stays within certain bounds using limit panning settings.

Step 1 Go to Add or Edit Map and scroll down to ‘Limit Panning Settings’ section.

Step 2  Enable ‘Limit Panning’ tab.

Step 3  Enter latitude and longtitude of south and north west and select any zoom level.

Limit Panning

Step 3 At the end, click on the Save Map.