Surya Siddhanta
भगवन् किम्प्रमाणा भूः किम् आकारा किम् आश्रया। किम्विभागा कथम् चात्र सप्तपातालभूमयः॥
O blessed one! of what measure is the earth? of what form? how supported? how divided? and how are there in it seven interterranean (patala) earths?
english translation