What type of substrate is safest for tortoises?

Safe substrates should support natural digging behavior while preventing impaction and injury. Topsoil, coco coir, and organic soil mixes are commonly recommended. Avoid sand, gravel, or wood chips, as these can be swallowed accidentally. The substrate should retain some moisture without becoming muddy. Proper substrate helps regulate humidity, supports joint health, and allows tortoises to feel secure in their environment.