Keshava appears in the form of a tortoise. His back is immense. Upon it rests the Earth.
Bearing her weight has left a hard, circular mark upon His back. Jayadeva offers praise to Him as Hari, Lord of the world.
A short poetic account from the opening of Gīta-govinda: the Earth rests on Keshava’s immense back in His tortoise form.
Added:

Keshava appears in the form of a tortoise. His back is immense. Upon it rests the Earth.
Bearing her weight has left a hard, circular mark upon His back. Jayadeva offers praise to Him as Hari, Lord of the world.
Source: Gīta-govinda · Jayadeva · chapter 1 · verse 6 ↗