Umugezi wa Gilgil
Umugezi wa Gilgil itwara igice cyubutaka bwa Great Rift Valley, Kenya na plateau muburasirazuba bwikibaya, gitemba kiva mumajyaruguru kigana mukiyaga cya Naivasha. Uruzi rujya mu burasirazuba bw'umujyi wa Gilgil, uri ku butumburuke bw'ubutaka buri hagati y'ikiyaga cya Naivasha n'ikibaya cya Elmenteita.

Uruzi rufite inkomoko hejuru ya metero 2500 (8,200 ft), aho imvura igera kuri milimetero 1100 (43 in) buri mwaka. Ifite amazi umwaka wose. Gilgil ifite amasoko atatu yingenzi. Morindati yazamutse kuri metero 2700 (8,900 ft), Kiriundu kuri metero 2.710 (8.890 ft) na Gilgil Ntoya kuri metero 2,400 (7,900 ft). Umuyoboro ntarengwa utambitse ni kilometero 60 (37 mi) naho igitonyanga kinini ni metero 873 (2.864 ft). [3]

Amajyaruguru y’ikiyaga uruzi rufungura mu kibaya kinini, aho rwacukuwe hifashishijwe uburyo bwo guhinga kuhira. Uruzi rwinjira mu kiyaga cya Naivasha rwuzuyemo Papirusi, izindi migezi na Tifa. Gilgil na Malewa nini cyane ni isoko y'amazi y'ikiyaga cya Naivasha. Byombi bitwara imyanda myinshi mu kiyaga mugihe cyimvura. Igisubizo kimwe cyasabwe kwari ugutera uruzitiro rwibyatsi bya Vetiver hakurya ya delta, byagaragaye mu tundi turere kugira ngo bigire umumaro mu gufata umutego kandi binafasha ibishanga kongera kubyara.[5]

Umuhanga mu bumenyi bwa geologiya J.W. Gregory yavumbuye umudugudu ushaje ku ruzi rwa Gilgil hamwe n'ibikoresho bya flake bitoboye hamwe n'ibibumbano bikaze, byabanjirije igihe cy'icyuma. Ibikoresho birimo ibishishwa byuruhu, borers nicyuma gito. [6]

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