"Thimamma Marri Maru, the largest banyan tree in the world covering over 5 acres. It is easily accessible from Ananthapur, and is located in Gootybailu village near Kadiri. The tree is named after Thimamma, believed to be a local saintly woman."

That is in Andhra Pradesh, India. Sorry I couldn't find the pictures off hand. i will try to post them

There is a tree called 'Timmamma marrimaanu" literally translated to Timamma's banyan tree. it is supposed to be largest banyan tree ever. If you are interested i will try to find out a few pictures and more details about it.
Thanks,