Police were informed of the incident at the Nam Huay Chamroo in Moo 11 village, Tambon Nong Ka Thao, Nakhon Thai district, at 3.30pm on Sunday.

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The mother, Sita Phatthara, 31, had rented a bamboo raft to go out to the middle of the reservoir, where she swam with her toddler.

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She had placed him into the inflatable swim ring but the boy slipped out. 
The raft operator jumped into the water to try to save the boy but could not reach him in time. 
The boy&rsquo;s body was retrieved on Sunday night.

Mother watches helplessly as her toddler drowns in Phitsanulok reservoir

An 11-month-old boy has drowned after he slipped out of a duck-shaped rubber ring while swimming with his mother in a reservoir popular with tourists in Phitsanulok.