Based on bathymetric measurements (Lukman 2010) the circumference of Lake Toba is 428.7 km. Samosir regency coastline length 115.8 km or 24.7% total Toba’s coastline. Balige district as capital Regency has a density level 49023 people/km2. With large population and highest in regency, residential areas spread from center to outskirts district. Along with technological advances current era globa...