ἐσχάτης δ’ ὁρῶ | πυρᾶς νεώρη βόστρυχον τετμημένον
Op de bovenkant van het altaar zag ik een een vers afgeknipte haarlok.
The genitive signals a place as a satellite. This is mostly a matter of epic and poetic language.
Many adverbs of place are in origin genitives: ποῦ; ‘where?’, αὐτοῦ ‘there’, οὐδαμοῦ ‘nowhere’. The genitive of place may, in its turn, accompany an adverb of place (although when it does so it is often interpreted as a genitive of totality).
This usage seems to have its origin in the genitive of totality, i.e. the genitive of the whole; the adverbs of place, however, seem to have originated from the genitive of source (Brucale 2014).