12-03-2020 Toba Indonesie Queen Maxima and King Willem-Alexander sailing by boat to the island of Samosir in the middle of Lake Toba and visiting the Silima Lombu Eco Village and the DEL Institute for Technology on the 3rd and last day of the statevisit to Indonesia.
The institute is committed to combating overfishing and discharging waste water in order to improve the water quality of Lake Toba.
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