"certain locations in" is a correct and usable phrase in written English
You can use it to specify specific places within a broader area or region. For example, "There are certain locations in the park known for their scenic views." This means that there are specific parts of the park that are known for having beautiful views. Another example could be, "The restaurant has branches in certain locations in Europe, including Paris, London, and Rome." This means that the restaurant has specific locations within Europe, and not in every city.
However, certain locations in reality need to be modeled in three-dimensional space.
Scientists have even determined what animals are dreaming by first having them walk through certain locations in a fixed order and recording which neurons are activated.
In many species, neurons are unevenly distributed across the retina, leading to nonuniform analysis of specific visual features at certain locations in visual space.
— Jeff Gordinier Washington Post: McDonald's will open vegetarian versions of their restaurants in certain locations in India, where they already don't sell beef or pork.
They are particularly prominent in more recently formed MAs, such as those in certain locations in Spain, where the structure of the traditional city has undergone sweeping changes.
But the official cautioned that police protection for some ventilation sites within the system, such as the 14th Street subway tunnel, had been longstanding, even if it might have been bolstered in certain locations in recent days.
Local topography is an important parameter determining the erection of a certain type of site on a certain location in the landscape.
For example, a person's memory that grass grows fast might be regarded as a state involving the existence of an electronic token of the sentence "Grass grows fast" in a certain location in the person's brain.
Even at the age of 10 he was cracking codes: he found a poem under the Christmas tree that led to a certain location in the house, where he found an index card with a big letter 'E' and another poem, which led elsewhere.
Each of these components is characterized by a certain location in the time-frequency plane.
Offenders' whereabouts are monitored and they are typically required to remain at a certain location in the evening and overnight.
