There are several synonyms that can be used for the phrase "keep to somewhere". One common alternative is "stick to", which means to adhere to or follow a particular path or route. Another option is "stay in", which suggests remaining within a specific location or area. "Remain on" can also be used to describe staying within a specific path or route. Similar phrases include "navigation through", which describes moving along a particular course, and "travel on", which suggests journeying along a particular path. Overall, these synonyms provide various ways to describe staying within a specific location or following a particular course or path.