The key site at the southeast end of the territory was Leach Lagoon which drains into Roper Creek.
The waterholes at Oluydune Dyrinyan and Wongalla (Wangala) on the King River were also in Tagoman territory..
Arndt, an agricultural research officer stationed in Katherine, came across an elderly Dagoman, Nolgoyma, soon to pass away, who was the headman of the few surviving members of the group and who provided him with some information.
While taking down notes, Arndt had the impression he was recording a people who had hitherto been overlooked in the ethnographic literature.
He made a brief report on their use of indigenous cereals for the journal Oceania in 1961, disclosing that this was part of a manuscript he had prepared, but not yet published, entitled "Recognition of the Previous Existence, Industry, Mythology and Rock Art of the Tagoman in the Katherine District, Northern territory".