There were emerald staircases which led to lakes full of variously colored lotus flowers and lilies, and swans, kāraṇḍavas, cakravākas, cranes and similar other valuable birds were visible in those lakes.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
वाप्यो वैदूर्यसोपानाः पद्मोत्पलकुमुद्वतीः । हंसकारण्डवकुलैर्जुष्टाश्चक्राह्वसारसैः
vāpyo vaidūryasopānāḥ padmotpalakumudvatīḥ | haṃsakāraṇḍavakulairjuṣṭāścakrāhvasārasaiḥ
SB 4.9.64