BLANC OR MATTERHORN is a reference to two of the most iconic mountains in the Alps. Blanc or Mont Blanc is the highest peak in the Alps, located on the border between France and Italy, while Matterhorn is a mountain located in the Pennine Alps on the border between Switzerland and Italy. Both mountains are popular destinations for climbers and hikers. The crossword solution ALP refers to the Alpine mountain range, which includes both Blanc and Matterhorn.