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LEARN THIS! Prepositions of place: on, in and by
a We use in with large areas, e.g. countries and continents,
and three-dimensional spaces:
in South America in Peru in the jungle / desert
in the air in a plane
b We use on with a surface or a line:
on a lake on the ground on the coast
on the edge of the cliff
c We use by to mean 'very near to':
by the sea by a lake by the river