Wild betta fish are found in Cambodia, Thailand and Vietnam. They live in river basins, irrigation and drainage ditches, wetlands and rice paddies. Although many people believe that betta fish live in small puddles, they actually live in larger bodies of water.
Bettas typically live in shallow, slow-moving bodies of water. According to Nippyfish, each fish is estimated to have a territory of about three square feet. Bettas are capable of breathing air but still rely largely on their gills and need oxygenated water. In captivity, they do best in warm, clean tanks with plenty of plants for them to swim through.