Postcard 1A - Lava Tubes
Yongcheon Cave, UNESCO World Heritage of Jeju. Thanks to Nurul of Malaysia for sending from Seoul, South Korea.
Postcard 1B - Lava TubesManjanggul Grotto - the largest lava tube caves of Geomomoreum system.
Postcard 2A - HallasanThe Royal Azalea Blossom of Mt. Hallasan of Jeju Island of South Korea. Nice stamps. Thanks to Joy for sending from South Korea.
Postcard 2B - Hallasan
Mount Halla's Crater Lake. When I was in South Korea, I bought these postcards of Cheju. There are the three major sites of this UNESCO World Heritage.
Postcard 2C - HallasanTop of Halla-san. Thanks to CYL who bought this postcard in South Korea.
Postcard 3A - SeongsanSeongsan tuff cone rising from the ocean floor.
Postcard 3B - SeongsanA different view of Seongsan. Thanks to CYL who bought this postcard in South Korea.