The is used with the names of:
- seas
the Atlantic, the Indian Ocean - mountain ranges
the Himalayas, the Alps - islands
the Cayman Islands, the Galapagos Islands - rivers
the Mersey, the Nile - deserts
the Sahara, the Gobi
No the with the names of:
- continents
Europe, Asia - single mountains
Mount Kilimanjaro, Mount Everest - lakes
Lake Malawi, Lake Titicaca