When it comes to describing the farthest north point of a location, "more northmost" may seem like the obvious choice. However, there are several other synonyms that can be used to convey the same expression. One option is "northernmost," which is commonly utilized to describe the extreme north point of a place. Another term that can be used interchangeably is "farthest north," which gets the same message across in a simple and understandable way. Additionally, "most northerly" is another phrase that can be used to convey this idea. Ultimately, there are several options available to describe the northernmost point of a location, so choose the one that feels most fitting for the context.