Native Mahayana Buddhism is practiced today in China, Japan, Korea, Singapore, parts of Russia and most of Vietnam (also commonly referred to as "Eastern Buddhism"). The Buddhism practiced in Tibet, the Himalayan regions, and Mongolia is also Mahayana in origin, but is discussed below under the heading of Vajrayana (also commonly referred to as "Northern Buddhism"). There are a variety of strands in Eastern Buddhism, of which "the Pure Land school of Mahayana is the most widely practised today.". In most of this area however, they are fused into a single unified form of Buddhism. In Japan in particular, they form separate denominations with the five major ones being: Nichiren, peculiar to Japan; Pure Land; Shingon, a form of Vajrayana; Tendai, and Zen. In Korea, nearly all Buddhists belong to the Chogye school, which is officially Son (Zen), but with substantial elements from other traditions.
What is the most widely practised Eastern Buddhism?
the Pure Land school of Mahayana