Some danger zones exist in the Andes of South America, the Rocky Mountains of North America, the Himalayas in Asia and, of course, the Alps in Europe, which stretch from France northeastward through Switzerland, Germany, and Austria.
فلكي تحدث الانهيارات ،‏ ينبغي ان توجد جبال بارتفاع ملائم ومناخ يسمح بتكوُّن الثلج والجليد .‏