Kalamanantan Sapphire Kratom is a very rare and unique form of Kratom. It is only found in Kalamanantan, which is an island in Indonesia. The leaves of this Kratom are blue in color and have a very high alkaloid content. This makes it one of the most potent forms of Kratom available. It is said to have a very strong euphoric effect and can be used to treat pain, anxiety and depression.