When describing a situation where a place is filled with a large number of people or things that it is becoming unmanageable, the phrase "be overrun with" comes in handy. However, if one wants to make their writing more descriptive and engaging, other synonyms can be used to replace "be overrun with". These include "be swamped with", "be flooded with", "be inundated with", "be overwhelmed with", "be crowded with", "be teeming with", and "be jam-packed with". Each phrase brings a unique description to the situation which can help the reader to visualize the scene accurately. Therefore, it is essential to utilize synonyms creatively to make the content richer and more compelling.