Alappuzha has a flat unbroken sea coast of 82 Km length which is 13.9 % of the total coastal line of the state. An interesting phenomenon of this seacoast during the month of June is the periodic shifting of mud bank popularly known as “Chakara” within a range of 25 Km in Alappuzha-Purakkad coast due to hydrolic pressure when the level of backwater rises during south-west monsoon.