Segara AnakÃÂ is aÃÂ crater lakeÃÂ in the caldera that formed during theÃÂ explosive volcanic eruption of Mount Samalas in 1257. The caldera is next toÃÂ Mount RinjaniÃÂ onÃÂ Lombok IslandÃÂ inÃÂ Indonesia. "Segara Anak" means "child of the sea" and refers to the blue lake's resemblance to the sea.