Their long historical past of selective breeding has produced a wide variety of color and finnage, earning them the moniker, “designer fish of the aquatic world”. According to Witte and Schmidt 1992, Betta splendens is native to Southeast Asia, adding the northern Malay Peninsula, central and eastern Thailand, Kampuchea Cambodia, and southern Vietnam. Based on Vidthayanon 2013, a Thai ichthyologist and senior researcher of biodiversity at WWF Thailand, the species is endemic to Thailand, from the Mae Khlong to Chao Phraya basins, the japanese slope of the Cardamom mountains Cambodia, and from the Isthmus of Kra. Similarly, a report from Froese and Pauly 2019 identifies Betta splendens as native to Cambodia, Laos, Thailand, and Vietnam. They also are found across the neighbouring Malay Peninsula and in adjoining parts of Sumatra, likely due to human advent. Wherever they are found, Betta splendens commonly inhabit shallow bodies of water with plentiful plant life, adding marshes, floodplains, and paddy fields.