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SCHWEIZ GREYERZERSEE ENTLEERUNG

People walk on the dried out shore of the Lake of Gruyere in Pont-en-Ogoz near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A group of kids take advantage of the low water level to collect waste during an afternoon organized to clean the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

People walk their dog on the dried out shore of the Lake of Gruyere in Pont-en-Ogoz near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).

SCHWEIZ GREYERZERSEE ENTLEERUNG

People walk on the dried out shore of the Lake of Gruyere in Pont-en-Ogoz near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A stranded boat is pictured on the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).

SCHWEIZ GREYERZERSEE ENTLEERUNG

A stranded boat is pictured on the dried out shore of the Lake of Gruyere in La Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A boat is pictured next to the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A group of kids take advantage of the low water level to collect waste during an afternoon organized to clean the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in La Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A boat, far left, is pictured on the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

People walk on the dried out shore of the Lake of Gruyere in Pont-en-Ogoz near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in La Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A group of kids take advantage of the low water level to collect waste during an afternoon organized to clean the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

People take advantage of the low water level to collect waste next to a stranded boat during an afternoon organized to clean the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

People walk on the dried out shore of the Lake of Gruyere in Pont-en-Ogoz near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in La Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A stranded boat is pictured on the dried out shore of the Lake of Gruyere in La Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

People walk on the dried out shore of the Lake of Gruyere in Pont-en-Ogoz near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

A group of kids take advantage of the low water level to collect waste during an afternoon organized to clean the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in La Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Boat docks are pictured on the dried out shore of the Lake of Gruyere in Gumefens near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Stranded boats are pictured on the dried out shore of the Lake of Gruyere in La Roche near Bulle, Switzerland, Wednesday, March 14, 2018. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Valentin Flauraud)

SCHWEIZ GREYERZERSEE ENTLEERUNG

Patterns in the sand and mud are pictured at the shore of the Lake of Gruyere in la Roche near Bulle, Switzerland, Saturday, April 20, 2019. The level of the artificial impounding reservoir is progressively being brought down by 15 to 20m, planning for the upcoming melting of heavy snowfalls accumulated on the surrounding mountains. (KEYSTONE/Adrien Perritaz).