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HOW DOES A LOCK WORK?
Locks are devices that raise and lower ships and other
waterborne vessels between stretches of rivers and
canals at different water levels. They are used to make a
river more easily navigable, or to allow a canal to take a
reasonably direct line across a landscape that is not level.
STEP 1
The ship approaches a lock. The first door opens and
the ship enters the lock compartment.
STEP 2
The door closes behind the ship. The lock
compartment is filled with water, raising the ship.
STEP 3
The far door opens and the ship departs at the new,
higher level of the waterway. Alternate lock sections
can be drained for incoming ships from higher levels.
C A R R A PAT E LO LO C K , P O R T U G A L
V I K I N G H E M M I N G, D O U R O R I V E R , P O R T U G A L
R I V E R L O C K S
Understand the science behind your river journey with our handy guide
