The largest

Largest Land animal – Elephant
Largest animal – Blue whale
Largest Bird – Ostrich

Largest airport- King Khalid international airport
Largest continent – Asia
Largest bay – Hudson Bay
Largest estuary – Ob
Largest Dam – Grand Coulee
Largest Canyon – Grand canyon
Largest desert – Sahara
Largest delta – Sunderban
Largest Gulf – Gulf of Mexico
Largest Hotel – Excalibur hotel in Las Vegas
Largest Island – Greenland
Largest lake – Caspian sea
Largest library – The Library of Congress, USA
Largest Museum – American museum of natural history
Largest ocean – Pacific ocean
Largest river – Amazon
Largest sea – South China Sea
Largest palace – Imperial palace