"Where the hat is" can be replaced with several synonyms. It can be replaced with "Where the heart is", a saying that means one's true home or family. Another possible synonym is "Where the action is", which means the place where exciting things are happening. "Where the money is" means a place where profit can be made or where wealthy people can be found. "Where the rubber meets the road" is a metaphorical phrase that indicates the point where something becomes difficult or challenging. "Where the wind blows" is another synonym that suggests an unpredictable or changing situation. These synonyms can be used in specific contexts to convey a particular meaning or message.