Il-Gelmus is a hill located in Victoria, Gozo, Malta, 1 kilometre away from Victoria's city centre. The estimated terrain elevation above sea level is 133 metres. The width at the base is 0.56 kilometres. In the area around Il-Gelmus are peninsulas, rock formations, beaches and caves.
The coordinates of Il-Gelmus are 36ð02'55"N 14ð13'58.01"E.
This hill has the maximum thickness of greensand layer in the Maltese archipelago. The greensand layer in Gelmus reaches a maximum of 11 metres.
This area is related to the legend of the Golden Calf of Gozo, and is also mentioned in the Maltese poem "L-Gçoáol tad-Deheb" by F. X. Mangion that also refers to this same legend.
The climate of the area is temperate. Average annual temperature in the neighborhood is 18ðC. The warmest month is July when the average temperature is 26ðC and the coldest is in January, with 12ðC. The average annual rainfall is 581 millimetres. The rainiest month is November, with an average of 157mm of precipitation, and the driest is July, with 1mm of rainfall.