Time Out says
This is the only land-based blowhole on the list and, admittedly, from the onset won’t seem as impressive as its coast-based counterparts. The Tocumwal Blowhole might not gush water, but it has been known to bubble. Think of it like a sink drain – the blowhole is located near the Murray River and water can gurgle up from the small opening at various points throughout the year. The local Ulupna and Bangaragn nations believe the blowhole is connected to the Murray by an underground stream.