The Union Jack.
It's a union jack. From England.
upper left-hand corner, as it is viewed
The Venezuelan flag has an optional coat of arms in the upper left hand corner on which is a white horse.
it was England, that's why they have the British flag in the left top hand corner of their own flag
The top left hand corner is the location of the union jack
Perhaps you are thinking of the flag of Panama, which has a white square in the upper left-hand corner with a blue star in the middle, a red square in the upper right-hand corner, a blue square in the lower left-hand corner, and a white square with a red star in the middle in the lower right-hand corner.
Cook island
The Venezuelan flag has an optional coat of arms in the upper left hand corner. It sits upon a white horse.
The flag for the South Australia flag has the southern cross in the top left hand corner and an eagle in a yellow circle down the bottom. This is it.
Five yellow stars in the upper left hand corner of a red field.
Any country's National Flag with a small Union Flag on the upper left corner was once a member of the British Empire.
The Union Jack (Union Flag) is in the upper left-hand corner of the Australia flag. "The Union Jack itself is a composite flag symbolizing the union of the historical components of the United Kingdom. It is composed of intersecting and overlayed red and white vertical and diagonal crosses on blue and white background." Source: http://www.anbg.gov.au/oz/flag-union.html