Lake Tondano, seen from one of the lake-side restaurants
This huge lake lies along the eastern side of a massive ancient volcanic caldera. Young active volcanoes such as Mahawu lie along the rim of this caldera. The lake, though covering a large area, is reportedly relatively shallow. There seem to be a lot of small fish in the lake, and fish farms line the shore as well. Ornamental koi carp seem to be big business here. A number of restaurants can be found built out over the lake, and there are even a few resorts where you can stay the night as well. The restaurants are a common lunch stop on tours of the highlands around Manado.