Erratzu enters the investigation as a point in a widening geography of infant deaths: an older case added to a map whose strongest visible line followed the river system rather than a likely escape route. Its importance lies in how the location helps connect a local loss to a pattern extending across the Baztán Valley and toward Guipúzcoa.

Setting in the investigation

The evidence identifies Erratzu as the home of a girl whose father had confronted the forensic doctor. When investigators expanded their map beyond recently documented cases, they added this older case in a different color, alongside the girl from Argi Beltz, Amaia Salazar’s sister, the girl from Lesaka, the daughter of the lawyers Lejarreta y Andía in Elbete, and another child whose father had confronted the forensic doctor. The evidence does not provide further details about the Erratzu family or the circumstances of the confrontation.

Erratzu also marks the beginning of the river corridor as Amaia Salazar reconstructed it. After initially considering whether the victims’ locations followed the N-121, she replotted them and found that the pattern became clearer when the children from Ainhoa were excluded. The line then ran from Erratzu to Arraioz, through Elbete and Elizondo, and onward to Oieregi, where the case of Haizea extended it.

A point in the river pattern

The map’s significance came from the relationship between settlements and water, not simply from proximity to a major road. The investigators’ broader survey found infant deaths in towns bordering the river, while the older cases extended the mapped sequence. Taken together, the locations traced the river from its source toward its mouth, with the Baztán River taking the name Bidasoa farther along its course.

The investigation also compared circumstances across the suspected cases. As a group, the families had generally been in difficult financial situations when their daughters died, and several later experienced improved prosperity; in at least four cases, family members had said at the time of the deaths that things would improve from then on. These were investigative commonalities, not individually established facts about the Erratzu family.

Narrative and investigative significance

Erratzu’s place on the map turns an isolated historical death into part of a question spanning multiple communities. The river line gave Amaia a spatial hypothesis to test, while the differing colors distinguished older cases from those found in the more recent survey. That method made the location meaningful without, by itself, proving a causal link between the deaths: the map organized the inquiry and directed attention to a shared corridor, but the suspected pattern still required behavioral and forensic corroboration.