Panorama of Halls Gap Picnic Reserve in Halls Gap, Victoria, Australia. The small township of Halls Gap is nestled in a valley between the Mount William and Wonderland Ranges in the 167,000 hectares large Grampians National Park in Western Victoria. Halls Gap is a tourist village with a multitude of accommodation and eaterise to cater for vast numbers of tourist coming to experience flora, fauna, abseiling, rock climbing, bush walking, cycling and many other outdoor activities.