Proto-MSA

*gāḥiy- - plain, valley (Kogan 2015: 554)

The origin is unknown. Of some interest may be Tna. guḥo ‘cave, crevice or hollow in a mountainside’. For ǯaḥi ‘soľ in Dathina v. GD 266 (due to MSA influence?)

Mehri
gēḥi - flat desert, desert plain (ML 118)
Jibbali
góḥi - flat desert plain (JL 74)
Soqotri
gáḥi - wadi (LS 107; CSOL I 543; CSOL II 463; Naumkin et al. 2015a:68)