Du-Ku

Du-Ku or dul-kug is a Sumerian word for a sacred place.

Translations

According to Wasilewska et al., du-ku translates as "holy hill", "holy mound" , or "great mountain"
According to the University of Pennsylvania online dictionary of Sumerian and Akkadian languages, du-ku is actually du6-ku3, with du6 being defined as a mound or ruin mound, and ku3 as either ritually pure or shining: it is used in the texts on the Univ. of Oxford site as "shining". There is no mention of nor association with the term "holy", and instead it represents a cultic and cosmic place.

Divine

The location is otherwise alluded to in sacred texts as a specifically identified place of godly judgement.
The hill was the location for ritual offerings to Sumerian god.
Nungal and the Anunna dwell upon the holy hill in a text written from Gilgamesh.