"On the grounds" is a phrase that is commonly used to indicate a specific location or position where something is happening or has happened. However, this phrase can be replaced with different synonyms depending on the context. Some synonyms for "on the grounds" include "in the vicinity of," "in the area of," "on location," "at the site of," "in the vicinity," and "within close proximity to." These words can be used to describe a location where an event occurred or where someone is currently located. In general, these synonyms help to convey a sense of locality or proximity, giving the reader a better understanding of the location being described.