The young girl is hidden inside her father's shirt, her right arm around her neck, as they are close to the coast. They were discovered on the Mexican side of the Rio Grande.
El Salvador's government identified them as Oscar Alberto Martinez and his daughter, Angie Valeria M.
The child was 2 years old, reported The Associated Press.
In the picture, the organs have come to lie near a river bank, where five discarded beer cans and an empty soda sit in the tall reeds. Another beer can flow to the girl's body.
Salvadoran officials said father and daughter were drowned on Sunday. Their bodies were found Monday.
Salvadoran's Foreign Minister Alexandra Hill said the government is working with the Mexican authorities to repatriate the remains.
She called on those planning to migrate to the United States illegally to refrain from doing so.
"Our county is in grief again. I pray to all families, parents, don't risk it," she said according to a CNN translation. "Life is much more worthwhile."
This is a developmental history. Return for updates.
CNN's Andrea Diaz contributed to this report.