Lake toba's north coast in sumatra, indonesia with clouds and calm waters, aerial view

lake toba sumatra indonesia north coast aerial view clouds calm water island tropical nature scenic travel blue sky tourism natural beauty indonesian landscape drone shot serenity tranquility vista horizon sunny southeast asia outdoors remote peaceful panoramic lush greenery vastness exploration holiday destination exotic untouched idyllic pristine clear sky waterbody geotourism cultural region batak volcanic lake largest lake supervolcano caldera ecosystem biodiversity destination