If you have observed in the first photo that this is a plant that grows near the water & it is abundantly seen during the rainy season. There are many delicacies made using this leaf as the main ingredient! Now, start guessing.
Note: I am currently enjoying my vacation & will be back after couple of weeks!!
Update: All of you have guessed it right. They are colocasia leaves used in making pathrode/pathra. Will give a tough one next time! Thanks for participating.