This research aims to identify the characteristics of health-related fitness in three provinces in Al-Baha region which vary in the sea level altitude, where Almandaq province is at an elevation of about (2500m), while Alaqeeq province is at an elevation of about (1540m), and Qalwa province is at an elevation of about (400m). The research also aims to determine the value, the significance and the direction of differences of the characteristics of health-related fitness among the (10-12) years-old children in the three provinces in order to identify the effect of the environmental factor on the measurements and tests included in the research procedures, and thus creating standard levels in light of the variance in the sea level altitude. The research was conducted on a sample from three provinces whose characteristics were as follow: Almandaq province (n = 312), age (10.67 ± 0.50), Alaqeeq province (n = 231), age (10.72 ± 0.44), Qalwa province (n = 211), (10.67 ± 0.31). The researcher applied the units of the health-related fitness Gulf test on the three groups, which included several tests as follow: 1200m run/walk test, hand grip test, (60 seconds) sit ups while bending the knees, stand and reach test, and measurement of the skin folds thickness in three areas of the body. The results determined the value, the significance and the direction of differences between the three groups and showed that there were significant differences in favor to the residents of the higher locations in all measurements of the research, and thus the construction of standard levels of health-related fitness characteristics was achieved for the research sample.