The tragedies occurred a few hours apart in the west of the country.
Pakistan was bereaved on Sunday after a bus accident and a shipwreck.
This one happened on Tandam Lake in Khyber Pakhtunkhwa province.
A ship carrying 25 to 30 students on a school trip capsized, a police officer said.
Ten children aged 7 to 14 were found dead and eleven others were rescued, six of them in serious condition.
Up to nine others were still missing.
At least 41 dead in a bus accident
Earlier today, at least 41 people lost their lives in a bus accident.
The vehicle, which was carrying 48 passengers, hit a pillar before going over the railing of the bridge on which it was traveling north of the city of Bela, in the province of Balochistan.
It exploded after falling.
One of the three survivors extricated from the wreckage succumbed to his injuries shortly after and the other two are in serious condition, said Hamza Anjum, an official in the Lasbela district where the tragedy occurred.
"We fear that the driver may have fallen asleep," he said, adding that the speed could also be the cause of this drama.
An investigation must be opened to determine this and DNA tests will be carried out to identify the "severely mutilated" victims, the official said.
Transport safety is often questioned in Pakistan, where mortality is particularly high on the roads, between expressways in poor condition, lax regulations and dangerous driving.
Buses there are often filled to the limit of their capacity and wearing seat belts is not a widespread reflex.
According to estimates by the World Health Organization (WHO), more than 27,000 people died on Pakistan's roads in 2018.
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