The deepening water shortage row between the US and Mexico

The US is accusing its southern neighbour of breaking a long-held water sharing agreement.

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On the shores of Lake Toronto, the reservoir behind the state's most important dam – called La Boquilla, a priest leads local farmers on horseback and their families in prayer, the stony ground beneath their feet once part of the lakebed before the waters receded to today's critically low levels.

Among those with their heads bowed is Rafael Betance, who has voluntarily monitored La Boquilla for the state water authority for 35 years.

"This should all be underwater," he says, motioning towards the parched expanse of exposed white rocks.

"The last time the dam was full and caused a tiny overflow was 2017," Mr Betance recalls. "Since then, it's decreased year on year.