Volcanoes of Kamchatka are a large group of volcanoes situated on Kamchatka peninsula. About thirty of them are active.

Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 154 km south of Seattle, Washington and 80 km northeast of Portland, Oregon. Mount St. 

Merapi is an active stratovolcano located on the border between Central Java and Yogyakarta, Indonesia. It is the most active volcano in Indonesia and has erupted regularly since 1548.The mountain was still erupting on 30 November 2010 however due to lowered eruptive activity on 3 December 2010 the official alert status was reduced to level 3. 

I love postcrossing, and I love when people write some interesting facts about their country. Now, I know that there're about 130 volcanoes in Indonesia ;)