The Sentinels but the well is dry

They stopped, Sam directing her to the first tree of his choice. Visala was not quite sure what to look for, but she would give it her best shot. Taking a good whiff of the bark, she was quick to wrinkle her nose. It reeked of sour urine and fur. A fox was here some time ago. A day or so, maybe. She then pressed an ear to the trunk, but reeled back from that. It's infested with bugs. She could hear the creepy crawly sounds - the tree was probably dying.

If it's a 'heart' tree, is it in the heart of the forest? That would have made sense, maybe she should have though of it earlier.