Safari hypermarket-Umm Salal Mohammed: it is in the North /Shamal Road (Old Road to Al Khor) if you are coming from Al Khor, you have to take the North Road, else you will have to come tru the New Coastal Highway towards Doha and catch north road (take right on signal after university)
If you come thru north road from Al Khor to Doha, you can see Umm Salal Mohammed on the right, (there is Umm Salal Ali, before Umm Salal Mohammed,dont be confused)
To go to Safari, i think you will have to take right from the 2nd Board showing Umm Salal Mohammed, Safari is located inside, you may ve to go almost 2 KM inside to reach Safari, (May be a bit difficult to locate as there is road works going on)
If you are coming tru Costal Highway and take North Road from Doha side you will have to go towards North to reach Umm Salal Mohammed.