Erosion could change the course of the Bug river, which marks the border between Poland and Belarus.

Erosion could change the course of the Bug river, which marks the border between Poland and Belarus.
He says the measures effectively amount to the suspension of the Schengen Agreement and are causing significant traffic disruption.
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The mercenaries will help migrants cross into Poland and may even enter disguised as migrants, says Morawiecki.
The arrival of Wagner forces in Belarus “could mark a new phase of hybrid warfare”, says Jarosław Kaczyński.
The governments say, however, that there is “currently no justification for reintroducing border controls” as two German states requested.
Poland’s human rights office has visited the group to ascertain their status.
“We must prevent a loss of control at the border,” say the interior ministers of Brandenburg and Saxony.
“Unfortunately we will encounter such provocations,” said the Polish government spokesman.
“I am convinced that it will be the EU’s best-secured border,” says Poland’s interior minister.
She suggested that hundreds of migrants who crossed from Belarus could have died and been buried in mass graves to hide the evidence.
The decision comes a day after the jailing of an ethnic Polish leader by Belarus.
The group described it as an “act of civil disobedience” to express opposition to the government’s “cruel” border policies.
Siddig Musa Hamid Eisa is one of at least 20 people to have died on the border since Belarus began engineering a wave of attempted crossings.
At a length of 206 kilometres, it will be the longest electronic barrier monitored from a single control centre in the world, says the interior minister.