Kratom strains are identified primarily by their vein color, geographical origin, and unique characteristics. The vein color of the kratom leaves is a significant factor: red vein strains have red-colored veins, green vein strains are characterized by green veins, and white vein strains have white or light-colored veins. Geographical origin also plays a role, with strains named after regions such as Bali, Borneo, and Thai, indicating where the kratom is grown. Additionally, some strains have distinctive features, such as Maeng Da, known for its potency, or Gold and Yellow strains, which are often blends or aged.