● Great Barrier Reef: Located off the coast of Queensland, Australia, it is the world's largest coral reef system.  
  ● Amazon Rainforest: Spanning across nine countries, it is the largest tropical rainforest, with the majority in Brazil.  
  ● Sahara Desert: The world's largest hot desert, covering much of North Africa.  
  ● Himalayas: Home to Mount Everest, the world's highest peak, spanning five countries including India, Nepal, and Bhutan.  
  ● Nile River: The longest river in the world, flowing through 11 countries in Northeast Africa.  
  ● Ganges River: A sacred river in India, originating from the Gangotri Glacier in the Himalayas.  
  ● Andes Mountains: The longest continental mountain range, running along the western edge of South America.  
  ● Lake Baikal: The world's deepest and oldest freshwater lake, located in Siberia, Russia.  
  ● Dead Sea: Known for its high salinity, it borders Jordan to the east and Israel and the West Bank to the west.  

•   Tropic of Cancer passes through 17 countries, India being one of them.

•   The Tropic of Cancer passes through eight states in India: Gujarat (Jasdan), Rajasthan (Kalinjarh), Madhya Pradesh (Shajapur), Chhattisgarh (Sonhat), Jharkhand (Lohardaga), West Bengal (Krishnanagar), Tripura (Udaipur) and Mizoram (Champhai).

•   Mahi River is the only river in India that cuts the Tropic of Cancer twice, first in Madhya Pradesh from where it flows towards Rajasthan and enters Gujarat where it cuts for the second time.

•   Follow the river all through Dhar and Jhabua in Madhya Pradesh, follow it some more as it enter Banswara in Rajasthan (you are on the Tropic of Cancer here!) and then follow the river back as it passes through Panchmahal in Gujarat and finally joins Arabian Sea at the mouth of Gulf of Khambhat.