"To explore the countryside" means to travel and visit natural areas outside of cities or towns in order to discover and enjoy the beauty of the rural landscapes, flora, and fauna. Full definition
Or, best of all, explore the countryside on foot, with an extensive network of trails that start in the village. (slowtrav.com)
This network of trails makes exploring the countryside and visiting its most outstanding sites easy to do. (slowtrav.com)
You'll still have the benefit of local guides at each destination, but the freedom to explore the countryside from behind the wheel. (travellermade.com)