You're asking for the 5 highest mountains in the world, not the 5 largest in terms of volume or area. Here are the top 5 highest mountains, measured from sea level:

1. Mount Everest (Nepal/China) - 8,848.86 meters (29,031.7 feet)

2. K2 (Pakistan/China) - 8,611 meters (28,251 feet)

3. Kangchenjunga (Nepal/India) - 8,586 meters (28,169 feet)

4. Lhotse (Nepal/China) - 8,516 meters (27,940 feet)

5. Makalu (Nepal/China) - 8,485 meters (27,838 feet)

It's important to note that these heights can vary slightly depending on the measurement technique and the year of measurement.