individual mountains and lakes
most countries, continents, regions, states, islands, provinces, towns, cities
when you say what somebody or something is
with buildings in a town
when it's clear who or what somebody is
with phrases like: at home/at work, go home/to bed/to work, next/last (week, month, etc.)
roads, streets, parks, bridges, shops and restaurants
when there's only one of something
with prison, church, school, hospital, university if you're thinking about the institution and its purpose
with specific nouns
with general plural or uncountable nouns
names of theatres, cinemas, hotels, galleries and museums
mountain ranges, rivers, seas, canals, deserts, and island groups
when you mention something for the first time
with general singular nouns
