Gelderland is the largest province in the Netherlands and is known for its diverse landscapes, including forests, heathlands, and rivers. It houses several historic cities such as Arnhem, Nijmegen, and Apeldoorn, as well as picturesque villages like Otterlo and Ermelo. The region is rich in cultural heritage, with attractions such as Hoge Veluwe National Park, the Kröller-Müller Museum, and historic castles like Castle Doorwerth and Castle Cannenburgh.